It's like when I buy too many groceries that will go bad before I can cook them BUT THEY WERE ON SALE!
Pittsbugh needs an above-replacement-level quarterback. Russ is One Year Veteran Cheap. Justin is One Year Rookie Cheap. But Pittsburgh has to decide if they want to exercise Fields' $25M extension two weeks after offseason workouts start, one week after the draft, and two months before training camp. Their yay-or-nay decision is going to determine which one of them is a lame-duck quarterback.
Or they could use a Day 1-2 pick on a QB and make both feel like lame ducks.