Seriously, do you watched them this season in Segunda? Muniesa was a walking desaster and Bartra wasn't capable of deffending against over 30 y.o. who have played in that league their whole life. We need to buy someone who can be a starter for Barca in a CL QF or SF..Puyol should be just a back-up CB from next season.
But isn't that what he's advocating? Masch as a CB is fine, as long as your pairing him with Piqué. So if you consider them as a starting CB pair for next season, then Puyol becomes your third reliable option who can fill in when needed (howver, the Masch-Puyol tandem won't cut it in the big games). I believe a natural experienced CB with/w.out puyol 'll prove useful.
And you're too harsh on Bartra and Muniesa. It's like one poor season, and you've almost written them off. Not many of our B-Teamers have flourished under Eusebio's coaching, and these players are no exception. Bartra's debut in V.Calderon, then the depo, malaga, BATE games with the first team have been promising. Although i do think Muniesa would do well, with another year in segunda, or a loan. But suggesting them players to be "promising back-ups" is hardly laughworthy. They could do with first team experience (achieved by introducing them towards the end of comfortable home wins, and lesser games), which could prepare them for the run-in in case of emergencies.
They could also flop altogether (so can our new CB signing), but can't judge without a trial.