List that is not absurd and ridiculous:
Best quarterbacks ever to be New England Patriots at some point in their careers:
1. Tom Brady..................his attitude alone placed him above the others right from the start
2. Steve Grogan............career trajectory similar to Brady, sabotaged by Dreith, Tatum (and Sullivan)
3. Doug Flutie................Kiam was a total idiot for not signing him and naming him the starter, regardless of who the coach was
4. Jim Plunkett...............a championship player throughout
5. Babe Parilli..................his TD record only broken in 2007 by Brady
6. Rich Gannon..............MVP
7. Cam Newton..............MVP
8. Vinny Testaverde......better overall player
9. Brian Dowling............Brady if Pats hadn't drafted him
10. Joe Kapp....................won titles in CFL & NFL
No offense, but I have a lot of issues with your list.
First, when I rank players as who they were the best at a given position for the Patriots, I only look at what they did in a Patriots uniform. I mean you can do it any way you want, but guys like Gannon, Plunkett, Newton, and Testeverde did nothing in a Patriots uniform. Their success was elsewhere.
Second, I think you overrate Plunkett. Sure he as two Super Bowl rings, he was more along for the ride than a huge factor. In fact his numbers sucked. His TD to INT ratio sucked and so was his completion percentage. He never made the Pro Bowl or was an Al Pro. He was just an average QB who hooked up with a great team in an era where teams won on defense and teams could win a Super Bowl with an average QB.
Third, Dowling was a journeyman QB who bounced in and out of the NFL and never stuck with a team in the NFL for more than a few years (most were one and done stints and some not even that long). The only NFL team he stuck on for more than a year was the Pats, but that was because he was a back up. I don't know if I would put him higher than Matt Cassel never mind Bledsoe.
Fourth, Joe Kapp had one really good year in the NFL. Granted his short career was because of the Vikes screwing him over with his contract and Rozelle determining the contract that the Pats signed him on was not valid and he had to have a new contract which he refused to sign (note the Pats had to give the Vikes a first round pick even though the Vikes voided Kapp's contract). And Kapp decided to retire rather than sign a new contract. So we will never know what he would have been.