Reynolds is a separate issue to guys like McQ, ET, Packer etc. Grub has hardly been on the field long enough to showcase his ability for Tigers, and whilst that can ultimately be as bad as any other non-performer, it’s less about the ability and more about the body.
Grub has played 17 or more games every season before he joined the Tigers (average 21 games), so there was no specific indicator that he would endure a run of injuries. Sure he’s getting older etc. but that’s every experienced player - you would cut Chris Lawrence tomorrow if the sole criteria was injury-free longevity.
You can shop Reynolds around ok, but who are you going to replace him with? He’s got 2 years to run and Benji has at most 1 more; the next in line would be Jock Madden and he’s just a kid, hasn’t even played his first CC match yet?