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riiiiiiiight... Because getting Vaped by Pure energy had to with stamina even though he was relentless in his attack on the Radiants home planet to the point that nothing else they did could stop him.
Because getting his neck broken by Superman's hardest punch has to do with Stamina even though Clark admitted that DD was getting stronger and tougher to beat as the fight progressed..
Because getting ripped apart by the end of time from Waverider's wristbands has to do with Stamina even though Hunter/Prey Superman was almost entirely battle-ineffective against him even after being in the middle of a 100 million Nuke equivolent blast......
Because getting stuck between 4 teleportationg tubes had to do with STAMINA even though he was completely dishing it to the entire JLA before getting tricked into them........
Because getting Vaped by Imperiex's disintigration beam had to do with STAMINA even though DD was tearing apart every Imperiex probe that approached him with absolutely NO signs of slowing down.......
Not to mention the fact that the only time we've seen DD's insides it pretty much was proven that he doesn't have any vital organs.
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Do you even understand what the term stamina implies?