Go ahead and list all the 4th CBs on other teams and tell me how many of them are quality starting players.
While Woods is likely a jag defensively, he's an excellent special teams player. While he played 130 defensive snaps, he was only targeted 9 times (6.9%) and gave up 7 completions. Compare that to Alex Austin who was targeted 12 times on 144 snaps (8.3%) and gave up 10 completions.
Vildor played 164 defensive snaps, was targeted 22 times(13.4%) and gave up 13 receptions (59.1%).
I'm not guaranteeing either of them a roster spot by any means. But you're ignoring the reality that team's 4th corners are either going to be a JAG Vet who excels on special teams or a rookie that the team is hoping to step up. The fact that Woods and Vildor both have experience as a 4th CB and that Vildor has starting experience gives them a leg up.
I fully expect Prunty to make the team. Watching him play, he seems to have the right amount of "IT", Swagger, and Instincts. Whether that actually transfers to the NFL awaits to be seen.
But the DEPTH that the Pats have, now, with Woods, Vildor, Dial, and Prunty behind the top 3, on paper, is very good.
Hitching your wagon to anything Andy says is a fools errand.