Every Major winning team excluding FNC in 2013 were a team in contention for some sort of deep run and arguably Luminosity depending on your definition of a deep run (Making past quarters) but even then they were in the conversation as a team that could upset the brackets if they got a good draw.
No win was a fluke, just not a likely outcome. I predicted that the C9 roster they won Boston with would win a Major down the road about a month before Boston but I didn't expect them to win it then. I said Gambit had big potential to take out some bigger teams and honestly the jump bug helped them since they got BIG in the Quarters so they had an easier draw (to be fair BIG beat SK clean without the bug) so it was all just how things played out.
Only other Major run that could be called a fluke was Immortals since I had them pegged for a a 2-3 exit. I knew they had the potential to make top 8 but I didn't think they'd do it and they ran all the way to the finals but even then they were a good team.