The NFLPA and the league need to find a way to address this issue so players can maintain their conditioning in a safe/COVID free environment without risking their contracts. This should be done ASAP before any further instances occur.
The league or the NFLPA (or both) should be covering this player's financial losses unless it can be shown that he was doing something out of the ordinary/reckless while training.
The amount of money involved is peanuts in comparison to the costs of a possible labor dispute.
I understand where you're coming from but I would caution anyone in expecting a quick search for the next quarterback if Darnold doesn't work out. Sure we can point to Pat Mahomes but you can also point to many other teams who were not so fortunate over the last decade or two. Look at how many quarterbacks the Browns drafted before Mayfield and even he is still proving himself. The qb hype of the 2021 draft has temporarily painted over some glaring trends of the past only time will tell how that works out with this recent draft class.