Martin is declining. It happens.
I think the bigger issue, potentially, is the scheme.
The line was declining a bit on the ZBS schemes under Philbin, but under Solari the line hasn't bounced back and IMO looks worse. Solari has been in the league long enough and has coached man and ZBS blocking schemes. Has the game passed him by? Does he have the right players for what him and Schott want to run?
The 2010's line was perfect for Callahan as all 5 were quick enough to get outside or the second level, while being strong and being sound technical wise. The worst player was Doug Free, and he was above average most years.
The staple of the mid 2010's line was the Outside ZBS. They ran it to death in 2014 with Murray. It wasn't until 2021 or 2022 that the Cowboys started to be under the average success hits for Outside ZBS. But they also ran power and inside ZBS, but the bread and butter was the OZBS. The line could road grade and then lock down pass blocking. Not going to see that level of play among all 5 guys for a bit.