I don't think Ethan Twomey is a recovery type player, a marker or a chaser. He's far better playing from the front and better suited to mid-field.
Pat Ryan and his selectors have to think outside the box more regarding the defence over the attack. We all know what Cahalane, O'Donoghue, and Downey can and cannot do but we need to see James O'Flynn, Liam Ryan, Fergal Lordan and Andrew McCarthy get a run in the South East League and hopefully then the National League. Also Sean O'Donoghue may be more influential playing further up-field rather than corner-back and it would put the onus on new defenders to develop during the Winter and early Spring.
Get well soon Mark Coleman!