If you look at all the differences that there are between the games instead of like the 4 or 5 things that are similar you realize that it is highly unlikely Smash 4 was influenced by P:M.
I highly doubt sakurai is downloading a mod to a game he made and going "oh, this is a good idea!" lol. The changes that were made similarly were similar because of common sense.
ex.
-DK dash attack, a roll that is in the games... not even the same animation
-Charizard's own slot, people liked charizard the most. If this was really influenced why isnt squirtle and ivy their own slots
-Charizard seismic toss, obvious reasons, not even same animation
-Ike's blue flames, obvious reasons
... thats all I literally can think of, there are so many more differences to just only focus on the few similarities lol
Its either that, or people dont realize what was in Brawl to begin with which transfered over to 4 because its a sequel. Seriously, Ive heard too many people say that Ganon's side-b in smash 4 is from PM lol.
Anyone who thinks smash 4 was influenced by it probably only thinks so because PM came first.
/thread