None of this is offensive. we are just fans talking on a message board offering opinions. Yours is just way out of whack comparing the "luck" of GS in 2015 to the cavs in 2016.
The thing is luck is luck. I think the argument is more degrees of luck.
Some teams are "luckier" than others". But luck is still luck.
The Warriors may have been luckier in 2015 because the Cavs were missing 2 of their 3 best players for longer.
Do the Cavs win if both teams are at full strength? Maybe. You can certainly make the case that the Warriors were feeling the pressure of their first finals while Lebron was playing in his 5th straight and 6th overall. They definitely struggled more than they should have with an undermanned Cavs team.
But, the Cavs were also lucky in 2016 that Curry wasn't at full strength and that Dray is an idiot. They weren't as lucky as the Warriors were in 2015, but they were still lucky.