Vaaks will be the primary initiator, and has the skills to do so well, but he's bigger, longer, stiffer and lower AST% than all the guys you mention.
Not by a lot, but he's just a further step down the path of where we've already been in terms of not having a PG in the classical sense.
I like point guards and positional basketball and I've been the boy who cried wolf on this stuff for years. I am not going to doubt BU's team construction abilities, and it's precisely because these guys don't fit neatly in positional molds that we're built to keep on trucking without a particular one of them. Again, knock on wood.