Mace Windu is Snoke
So what if when Mace Windu flew out of that window on Coruscant he hit his head and got a nasty scar from it. Then when he woke up decided he was really, really mad at Anakin Skywalker for betraying him and this creating long-standing grudge with anyone sharing that name. Mace WIndu was known to sometimes use the Dark side of the Force to augment his own power, that is why he has a purple lightsaber as well as why he utilized the Vaapad lightsaber form. Both the color and form denote his proclivity to channel his anger into power without fully embracing the Dark side. All of these things have lead some to say that Mace Windu is in fact Snoke and is now out to finally bringing balance to the Force by eliminating the Jedi.