The Stevenson from 5 years ago would've sparked him. I don't think he could beat Badou Jack
Jack is my guy but if I'm being honest I'd pick Gvozdyk to beat him.
Gvozdyk impressed imo, very good skills and movement, took his time, cold headed, listens to corner advice
If Jack can push him in corners or onto the ropes and he can rough him up he might have his way but I doubt Gvozdyk would let that. He has faster feet, I suspect that Jack would follow him trying to do damage while getting outboxed from the outside most of the night.