Another underrated thing is Mount's contribution in the CL run: an important goal in the semis against Real Madrid, and an assist in the final... not to mention the hard work mentioned above. He's also an underrated passer--better than Conor in that regard IMO. Of course, all of that is past tense: not at the club and struggling with fitness elsewhere (maybe the club knew something?).
I think Conor still has a lot to prove, so while I'd like him to stay, I understand if the club decides otherwise; it might end up being a cost/benefit decision with FFP in the mix.