[Tainojim]

Dude those are some good points in drumming. But using arms strength instead of wrist is not a bad habit and Travis Barker did just fine.
As far as getting a grip, there are no rules to that. Lots of people don't even know about the unwritten laws of drumming.
Just speculations. Lots of self taught drummers have made it to the top. No broken rules, laws or bad habits were applicable to arrest those drummers.
Bottom line is that some are born with rhythm and don't need to be assaulted literally by those who think that having a teacher to show them what to do or how to do it by those who have written books.

Text books are not at all accurate. These are the criteria that teachers use. If the sticks feel comfortable in the hands and you can play drums, use of common sense that's all that counts.

If ya ain't got the rhythm, get a metronome, it helps. Learning by the book doesn't help if you weren't born for drumming.