I mostly agree with everything you've said in this conversation. But I'd point out that when people are talking about the importance of regular season, it's because they want to make sure guys like LBJ and Kyrie don't rack up too many minutes. Delly soaked up a lot of minutes for us last year in the regular season and the first couple rounds of the playoffs. We've got a huge void when it comes to that with backup PG this season, unless you're confident Felder can fill that role (I'm not).
Having said that, I'm not thrilled about the idea of Rondo in this role, even at a vet. min contract.