I think everyone is different with how they recover. I had mono when I was 21 and felt normal within a couple of weeks. I do agree with you in this sense, though. Darnold came out of the off season and training camp in peak shape and ready to go. Then he is forced to do nothing for over a month and gets deconditioned. Even if the illness is completely gone, it's not possible to get in the same shape and catch up at the same rate during the regular season routine like you can during training camp, especially in those first few games back. I think by now though it shouldn't be an excuse. I also think the risk of splenic rupture is back to what it is for the normal population or they wouldn't let him play.