TT profitable stack off here?

I'm curious the logic for 4betting. If the CO 3bets with something like a 20% range (you list his 3bet at 16, but since he's in late position, it's probably a little higher than that number) but only calls or shoves hero's 4bet with JJ+, AKo, AQs+ (3.3%), then CO is folding to a 4bet more than 80% of the time. At that point you can 4bet bluff with any two cards. On the other hand, if CO calls or shoves with 40% of the hands he 3bet with to avoid being exploited, then he's calling/shoving with an 8% overall range. TT has 53% equity against an 8% range like { 66+,AJs+,KQs,AQo+,KQo }.

Edit: I guess my point is that if you're 4bet bluffing (in the sense of hoping for folds to make a profit), why use TT and not something weaker? If you're 4betting for value, it seems a little thin even against about as wide as CO would ever call/shove.