There’s been plenty of backtracking, but it seems the plug n’play Patriots Way is the closer answer. The “master plan” of rebuilding wasn’t what Patriots sources were singing about when Brady left; they were clearly indicating that Stidham could take over at a cheaper cost and produce a lot of what Brady did in 2019.
This article is an interview with Scarneccia from 2020, and he had been with the team through the 2019 season. He clearly assumes the plan is for Stidham to take over.
The former Auburn QB has much less experience than his predecessor in New England, but he has more mobility.
www.al.com
Belichick also declined to draft a QB in 2020 (!) and - from all reasonable inferences - thought Stidham was ready to take over. The team had no cap space, so Newton was just a really unlikely alternative option who came up later on due to a Covid crashed market.
There multiple threads here in this forum that Stidham was going to be the guy.