Now that we know that Toei will be shooting the Legend War of Gokaiger (ゴーカイジャー) again for Power Rangers excluding teams before Zyuranger (ジュウレンジャー), I decided to modify this post I did for 'Saban Brands.' I do not know many Japanese or Kanji but I am going to copy and paste some key words. Toei will probably not read this but I just thought I'd do it anyway. I wrote this in simple language to be easy to translate.
Power Rangers: パワーレンジャー
Legend War: レジェンド大戦
Toei: 東映株式会社

1. Excluding Teams
Dairanger was not a Power Rangers team. Only Kiba Ranger was adapted to White Ranger. Kakuranger was indeed the Aquitar Rangers. 忍者戦隊カクレンジャー (Kakuranger) = エイリアンレンジャー (Alien Rangers). キバレンジャー (Kibaranger) = ホワイトレンジャー
2. Additional Rangers
Toei don't forget there are some extra Power Rangers that were not in Sentai.
Titanium Ranger: タイタニアムレンジャー
Phantom Ranger: ファントムレンジャー (VRV Master of Carranger VRVマスター)
Elephant Ranger: エレファントレンジャー
Shark Ranger: シャークレンジャー
Bat Ranger: バットレンジャー
THE FOLLOWING, EVEN IF YOU ARE NOT GOING TO USE ACTORS, AND JUST SUITS, TAKE THIS INTO CONSIDERATION:

The Mighty Morphin Powers themselves were said to be destroyed but we did see them be reused in the episodes"Always a Chance", "Forever Red" and "Once A Ranger." Jason and Rocky were the Red Ranger, but it can be said Jason would be the Red Ranger. Rocky could take the place of a Zeo Ranger. Zack and Adam were the Black Ranger. But it can be said Zack would be the Black Ranger. So Adam could be a Zeo Ranger. Billy is always Blue Ranger and was only the Blue Ranger. Trini and Aisha were the Yellow Rangers, We can say Trini is Yellow even though her actress Thuy Trang passed away more than a decade ago. Kim and Kat were the Pink Ranger. But it could be said Kim to be the original Pink Ranger and Kat can be a Zeo Ranger.

Zeo Powers were abandoned and still active as seen in the episode "Forever Red." If Zack takes place of the Black Ranger. Adam can be the Green Ranger for Zeo. If Jason takes spot of Red Ranger, Rocky can be Blue Ranger for Zeo. Tanya can be Yellow Ranger, Kat can be Pink Ranger if it is supposed that Kim was Mighty Morphin Pink Ranger. And even though Jason was the Gold Ranger, the powers are now with Trey. This is assumed in "Countdown to Destruction" finale for "Power Rangers in Space" even though we don't see his face.

Andros was Red, Carlos was Black, TJ was Blue, Ashley was Yellow, Cassie was Pink and Zhane was Silver. But Carlos, TJ, Ashley and Cassie were also the Turbo Rangers. Adam, Tommy, Tanya and Kat were Turbo Rangers too but if they are busy being Zeo Rangers, then who are being the Turbo Rangers if the other four will be Space Rangers.

Tommy, Adam, Tanya, and Kat were Turbo Rangers but if they are busy being Zeo Rangers, then they can't be Turbo Rangers. TJ, Carlos, Ashley and Cassie were Turbo Rangers but if TJ, Carlos, Ashley and Cassie are busy being Space Rangers, then they can't be Turbo Rangers. The only Ranger you can have with Turbo Ranger is Justin. Even if you are not using actors and just suits, you have to take this in consideration when shooting a scene that has a lot of past teams and suits. Then you would just have the Blue Turbo Ranger by himself.
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Writing loophole: In the episode "Robot Rangers" of Turbo, it had been established that Zordon was making robot duplicates of the Turbo team, namely Justin, Cassie, Carlos, TJ and Ashley. So we can say they are being used.

Even if Turbo Rangers and Space Rangers are excused by new members, Power Rangers still limits how many Ranger suits can appear because Tommy has been many Ranger. Tommy has been five in fact. Only one of them that was used by someone else and can be replaced. Above we see the back of four Rangers, using the terms of Power Rangers: Red Turbo Ranger, Zeo Ranger I Red, Black Dino Ranger, White Ranger, and Green Ranger.

Tommy had five powers: Red Turbo Ranger, Zeo Ranger I Red, Black Dino Ranger, White Ranger, and Green Ranger. Even if they have the helmets on, it wouldn't make sense for them to exist. Above photo is from the episode "Fighting Spirit" of Dino Thunder, where Tommy is in a coma and has to fight his past selves but it was their spirits in a dream realm. So Saban producers, if I had to do it, I would just choose one suit for Tommy. What I was thinking is that Tommy can call upon the powers of his other forms. Or they can say they got Tommys from other timelines or friends in place. My guess is that Toei will just have those five Rangers and then the Saban writers have to come up with excuses for it.
Easy to Use
The following Ranger suits you can't use without a explanation and then there will be fan complaints....
ドラゴンレンジャー (Dragonranger) = グリーンレンジャー (Green Ranger)
キバレンジャー (Kibaranger) = ホワイトレンジャー (White Ranger)
オーレッド (Oh Red) = レッドジオレンジャー5 (Zeo Ranger V)
アバレブラック (AbareBlack) = ブラックレンジャー (Black Dino Ranger)