Interesting thread.
If time-machine Ovi would be transported to '80s with all hindsight, modern equipment, training-methods etc. with his line-/teammates with similar modern perks, they would crush whole league with their efficiency.
However, if time-machine Gretzky & co. would be transferred to modern-era and forced to stick in their '80s gears and habits against current opposition, they wouldn't thrive as they did during Edmonton's dynasty era.
But, if it would be possible to put Gretzky & Co. to some sort of time loop during 2010s (for saving years of their prime) to learn the ways of current hockey, to use contemporary equipment properly, to make adequate training etc. they would absolutely crush '80s league and form the Dynasty there back in time, if they would be sent back into those days.
uh... oh...
They actually did that without modern gears, training, and experience from '10s hockey!!!
So, maybe it's impossible to send hockey equipment via time-machine (like in Terminator movies), and time-traveling seemingly caused also total loss of memory to whole team, as well as disappearance of all physical gains from the future training and nutrition as skinny Gretzky still needed Semenko on his side, while wooden sticks were still in favor, butterfly wasn't yet developed...
Whole future training gone waste and still they won 5 Cups, and The Great One managed to cumulate totally ridiculous numbers.