I think I understand a little bit of what your saying 97. I don't think you can expect Grant to dunk a lot as this is not his game, but I do think he can be more aggressive and physical. Example from the Dayton in 2 different plays.
I believe it was Grant in the first half posted up and backed down Obi, and at one point he lowered his shoulder right into Obi and knocked him back a few feet. Might have been charge, might have been good acting by Obi - who knows. Refs called nothing and Grant had an easy layup. Point here - he was physical, he took the action right to Obi. Even if he would have gotten a charge - I would have been okay with it. Cause at the time Obi had 1 foul and at that point - you need to go right at him, be physical, and make the refs make a call. This time they didn't, and he got an uncontested layup.
Play 2 - total opposite. Grant posted up and got to the middle of the lane, and Obi was right on him. Grant pumped fake and head faked about 5 times and Obi just stood there like a Dad does to their toddler child. Finally - when Grant decided to shoot - Obi just swatted that thing away like he was playing with a bunch of little kids. In this instance - he tried to finesse him, rather than go right at him and be physical.
I would tell Grant to watch Tim Duncan tape from college. Duncan was lighter and more athletic, but he had the ability to use his body to create angles and get the advantage over his defender. He also knew when to face up his defender and use the bank shot that made him a hall of famer. I don't expect Grant to dunk over people and think he is a good player for the Spiders, but I do agree at times - he shies away from the contact and tries to avoid it rather than invite it with his big frame, which is one of his biggest advantages.