Good stuff, Ross.
If we're just exchanging ideas, I'd probably swap out your last position of DE and replace it with LB, but that's just me. I'm still a bit hesitant to fully drink the Kool Aid in regards to Jamie Collins definitely being extended. My concerns are mainly due to three factors: 1) The rising cost of players at the position and the fact that he'll likely be demanding a very large pact, and 2) The fact that Butler is also in the mix as well, and finally 3) The fact that Hightower is the rather clear cut priority and I believe he'll stay.
The fact that we can squat on Butler for another year may help the case to keep Collins, but it will be up to Belichick to determine how risky waiting may be in terms of driving his price up with another successful year. Of course all of this may be irrelevant since as we know, Belichick is unlikely to pay over what he deems as market value anyway. I hate to sound too pessimistic, but I'm truly crossing my fingers as it pertains to a Collins extension. There's a good possibility that he'll want to test the waters come spring, so I'm hoping they can lock him up with a fair deal before that (obviously). If he hits FA, he's probably long gone in my opinion.