So, let's not have an backups and let's count on Stidham to take to us the playoffs because 20 YEARS AGO Belichick chose to keep Brady. Personally, I would have not have kept Bishop on the squad. And just BTW, Belichick waiting until the 6th to draft Brady.
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Please understand, the draft is about expected value. If late rounders are just as likely to be great, we should just trade our top picks. The reality is that, for any team, their top picks are more likely too be successful than there lower picks. There are lots of stats. You can check the percentage for success of various positions at various draft choices.
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QUARTERBACKS
Most top QB's are drafted in the top 10. There are percentages after that. Even if a team is great at picking quarterbacks, they might be able to get late first round value in the 2nd, or 2nd round value in the 3rd, or 3rd round value in the 4th. The point is that even 2nd round value is unlikely to developing a top quarterback. That is why it is usually good policy too have a backup with potential.