He had to compete with Varejao (who was playing amazing compared to previous seasons) to begin the season so his rebounds were a bit lower. He's picked it up though with more opportunities the way Ed Davis has when he got more opportunities. Not to mention the 11 PPG being 6th in FGA on the Cavs is solid.
And if those numbers aren't good, what does that say about Davis? For the month of January when both have been starting, they've been playing similar minutes but he's been outscored and outrebounded.
Thompson is their starting PF. He needs to create his own offense. Saying that he is sixth in FGA on the Cavs is his fault.
Davis has been scoring very well and efficiently too. For someone with such a limited offense, that is quite impressive.