Ally attended his first IRL tournament late last year I believe. He utterly destroyed Canada's top competition, including King Ace (the best MK in Canada, placed 5th at Critical Hit 4, beat Azen in pools at COT4), JL and Ambrose. These were players attending
every tournament since Brawl's launch, and out of nowhere, Ally, some "wifi scrub", takes a royal dump on them.
His third IRL tournament attracted the likes of Lain and NOJ from Michigan. He beat them too. All of this from huge amounts of wifi practice, playing with his brother, and 3 irl tourneys.
How much does playing wifi specifically help you with beating MK? Of course, that varies depending on your skill. But I can guarantee that if I practiced with judge or another good MK over wifi on a consistant basis, I would learn the matchup very well.
It is obvious that wifi skill transfers to offline play. Judge, an MK from Michigan, came from out of nowhere, playing only Wifi. He is now the best MK in MI and one of the top MKs in the country. Ally needs no introduction. Same with ADHD and Anti. These are players who all practiced hard on wifi, and their irl tournament records show it.
The only matchup Anti couldn't really practice over wifi was the elusive "mom" matchup. It screwed him at COT4, but surprisingly, Apex, which took place on Mother's Day, was no problem for him! Moms are just wayyyyyyy too good