No.
Anything mentoining Ridley garners huge attention from the Smash community, especially before E3.
I call it a troll move untill proved wrong.
And guess what?
With all the huge details in these "leaks" and given the fact we've only properly seen Inklings as newcomers, and just Mario and Link as veterans doing bascially nothing... it's gonna be REALLY HARD to discredit the "leaks" with what's about to be shown. Because I honestly can't believe they'll outdo Smash 4, or even Brawl, with the amount of new characters they are gonna show.
So what's left?
Say the leaks get ONE thing right in common, say, the Ice Climbers return and a newcomer that everyone anticipates and predicted AND is shown on the "leaks" is also showcased... Who's gonna say the "leaks" are true or false?
Way to get yourself trolled Smash community
Said it once, and gonna say it again: unless something marginal akin to Wii Fit Trainer's prediction is gonna be leaked and predicted right, I won't believe ****.