Troy is such a blank slate it's fine, since Marvelous was trying so hard to be "Cool" and "Stoic" his mannerisms were practically nonexistent (Marvelous would do a ranger's signature pose, but put no energy behind it).

As for Noah/Joe and Jake/Doc...Yeah, I dunno...

Yes, but they had the Zeo Crystal to explain that.
This is like if W got adapted and it went up to the Trigger Magnum and then cast aside Gaia Memories for Medals.

The fact that the Megaforce characters act nothing like the in-suit Gokaiger scenes will likely just be ignored.
Just look at how the White Ranger acted in his mecha in his first appearances of MMPR. That was obviously not supposed to be Tommy.