While I agree the OL played better last year than this, I don't think it has as much to do with the system as it does our opponents. The D we've played thus far have been very good. Last year we had some really inflated numbers against teams like SF, Rams, Browns, Raiders, etc. We were held to less than 70 yds rushing in 25% of our games. TT had almost 600 yds "rushing" (more a reflection of poor pass blocking and QB play than our ability to run the football). Our OL hasn't been very good for years and is a big reason we haven't been successful. We've struggled against big aggressive DLs as our OL are pretty soft (RI excluded). Without a top 10 QB and with a mediocre OL at best and a dearth of talent at WR we aren't going very far again this year.
I don't IMHO see an ego thing but rather FO recognizing the "talent" we have won't get us back to the SB. While we aren't tanking, we are rebuilding. Shedding overpriced marginal talent or me first team second guys with poor attitudes makes sense to me.