Because they're really, really shite? Also, neither of them can actually play left side of defence. I didn't see any evidence of Considine slowing and declining pre injury, he started the season well and was doing fine. Plenty of defenders play in the SPFL until their late thirties, it's not difficult. Mulgrew just played 90 minutes in midfield for Utd today, there's nothing in Considine's history to suggest he wouldn't manage otherwise, and you're not providing any evidence of that either. Goodwin even offered him a contract. But the reason he's not playing is because it wouldn't look good, not because of ability (which is fine, the damage is already done). The problem is that we're stuck with Bates and Gallagher next season now, and if they're continued to be played as a partnership we'll do as badly as this season (Willie Miller and Michael Stewart also said as much after the game, it's obvious). The alternative is that we have either Bates or Gallagher on the bench, which I think will be terrible for squad harmony. Both are likely on large wages and will likely be on better wages than whoever comes in to replace one of them. Either that or we let one of them go in the summer, in which case we're adding another acquisition to a massive recruitment list which I think is stupid. We should be getting rid of one of them, it just makes much more sense having a good professional who's played 500 games for the club to challenge for the first team position rather than one of two very expensive failures.