They should.
However.
Running is an even playing field. A race finds the winner simply due to cardio in running. The track is neutral, just as a bar is neutral for lifters.
If you have more talent or weight than a wrestling opponent, his system is fighting against more resistance and/or worse positions. The two guys aren’t playing the same game due to sport specific abilities.
Also - wrestling is anaerobic and muscular by nature. The creative-phosphate (burst of strength) pathway andthe anaerobic pathways are heavily at
play, nearly entirely those pathways, in fact. Running anything over 400m is nearly entirely aerobic.
On TOP of that - big dudes can be in great shape, but simply not be built for running just by carrying the extra body (short femurs also play into running stride)
Really, it’s apples and oranges.
Athletes should cross train, but if you want to become specific there are sports that you simply are not genetically built to reach any great heights in. Running is still good work, but you can’t simply judge a big or explosive athlete directly by his distance running times.
Funny enough, my old training partner and I, who between the two of us owned every bit of gym equipment and got into all kinds of cardio and resistance training, decided that you could work all systems with no equipment at all.
We never did this, as he moved away, but we wanted to simply run/swim/climb around over a long distance, stopping at good spots of grass or sand for a best of seven takedown contest, possibly throwing in some push-ups, pull-ups, burpees, squats, or lifting a big stone.