The thing about Toure, is that he's a very old player.
There's not much upside with him as he's pretty already maxed out his ability.
Playing younger players has a two-fold net+ gain, they're more athletically inclined & can make plays that a slower/older player can't make, they get experience with more reps & can grow exponentially throughout the year.
Toure in week 0, is going to be the same Toure in week 12, good or bad.
Marcelin, Pruitt etc, on the other hand have the chance to be much better than what they already are by the end of the season with more opportunities.
I get you give up experience with decreasing Toure's & Smith's snaps, but there is no amount of experience that can supplement for lack of foot speed & lateral movement.
The TD Toure gave up was nothing but pure Athlete vs Athlete & the younger faster guy won.