#1 and 3 don't matter. If #2 doesn't happen the ball is not intercepted. Period. The DB play and wr have no bearing on if through qb puts the ball where it should it will not be intercepted. It will just be incomplete which is what we can live with.
#1 matters just as much as #2 does. If the WR gives the QB no help on the ball, then it can lead to an INT. I understand accuracy matters for the QB, but the WR needs to make a better break attack the ball in the air.
Not all INT's are the 100% fault of the QB.
A comeback is an outside breaking route. If the qb throws the ball on time and to the outside the ball will not get picked. The ball was picked bc you can't miss inside. If you miss inside then the WR slipping matters.
If the WR makes a bad break and isn't to his spot on time, it doesn't matter where the QB throws it.
If it's a bad throw outside, it's an incomplete pass.
If it's a bad throw inside, it's a pick 6.
On an outside breaking route, it absolutely matters where the QB throws it.
If the receiver's "bad break" leaves him towards the inside, the QB has a split second to try to complete the pass.
The point is, the INT (in practice) isn't completely Tommy's fault.