If we’re talking about NFL QBs there have been plenty of “weak”-armed QBs. What is the baseline necessary deep range, 60 yards? Can Morgan throw it 60 yards? I’d say yes. Beyond that accuracy, anticipation, release, mobility, and bus factor/height.
A cannon is not necessary for success, but maybe anticipation and accuracy are, flight time on deep outs versus elite DBs, etc. Mobility for shorter QBs? The ball has to be out of the throwing hand within what, about 2-3 seconds to avoid getting sacked or pressured. Does it matter if a QB can throw it 80 yards when it’s rare to have the time to connect with a receiver going that deep.
In summary, I wouldn’t say it’s impossible for Morgan to at least get a look. I recall a guy named Kellen Moore was probably even more limp-armed and played in the NFL because he did everything else pretty well. Who are some other weak-armed QBs.