Edgecrusher wrote:It COULD work if they get hit by a shrinking ray befor battle giving them the right size unless they fight eachother
A shrink ray? Where would you find a shrink ray in the 16th century? I mean, c'mon.
Even so, Link, Spawn, and Heihachi had reasonable excuses. Link was sent because Ganondorf was being controlled by Soul Edge, and Zelda didn't want that happening again. Spawn was sent by Malebolgia to GET the Soul Edge, and Heihachi was sent because a Soul Edge fragment tasted his blood and sent him back by accident.
Even Yoda and Vader can be reasonably explained: A mishap with Hyperdrive sent them to 16th Century (Possibly modern day to them) Earth. Both sense Soul Edge's Dark Side power, and then Vader chooses to steal it for more power, and Yoda decides to stop it.
But Prime and Megatron have no good reason to be tied to Soul Edge. Megatron wouldn't want it because it's a filthy human weapon. Prime wouldn't even care because, if Megatron is there, then he's got bigger problems than Soul Edge. (And if Megs doesn't care, it wouldn't be any consequence to Prime) And if there's a shrink ray, how would they transform? And if it's 16th century, what would they transform into without horribly disrupting the timeline?