Hi guys i have a lot of coins rollin in the exchange shops (ranked and survival)
Im midnight

I heard something like some of the ninjas in the exchange shop will be locked/replaced in a future update or something so we should get them now like Kakuzu , Kisame, Hidan etc

Is this true ? if it is then is it worth getting those ninjas for my class, is it worth getting them overall?
I also heard there was a system where u would eventually have to get ALL ninjas - that also true?

Someone pls enlighten me about this , thank u

and also is Tobi also worth spending the points to get him? Same with kisame?

Thanks in advance