Only going to address #3. Didn't Desir make a fair catch on a lot of punts because they were well covered and he would have been crushed as he caught it?
Estime's return against Minnesota was great but the punter out-kicked the coverage, and the announcers said that at the time, if I recall.
On kickoffs, the recent rule change has tilted the calculus in favor of taking a touchback. Kicks are going into the end zone, and you had better have a superstar back there who can get the ball at least to the 25, or you lose on balance. Not sure if we can scheme or coach that with the return team, in general. If we don't have a Qadry Ismail back there, I'm fine with taking the touchback. Could Estime be that guy?