Full disclosure I am a TT supporter.
Isn't it possible that Sammy could be open but the design of the play and the defense still dictates the ball goes elsewhere? I suspect there are many many times TT just doesn't make the correct read or even if he does he does not pull the trigger. However I am sure there are times where Sammy is not the primary option in a pass play yet he still has a route to run and he may indeed win that battle. If the primary read is open the ball should be delivered there. That is the way a play is designed.
Now I would argue they don't design enough plays that make Sammy the primary target. He should get 8-12 plays specifically for him a game. Add in the rest of the passing plays and he should be getting 10-15 targets a game. What is it now 5 maybe 6 a game? That has to change.