First, I'm not sure if you're feigning ignorance but just because foxes camp at midrange all the time doesn't mean that it's a good tactic. Second, no offense, but putting lucky and lovage in the same comparison makes no sense. Lucky is significantly better, and him losing to hugs actually means something: hugs knows the matchup better, or hugs is a better player. Oh, btw, sheik is a significantly faster character than samus overall, and when she gets a hit on fox, it's far easier to start punishing than if samus does. Samus and sheik dealing with camping is hardly comparable.
M2K vs amsah would be better because M2K was playing better in those matches, and according to m2k himself he played terrible against over. I'll even quote m2k: "My Marth beat him both friendlies we played and johns or not my marth was REALLY really off this game so I switched to Fox (I do not like Fox vs Sheik but he is bad vs Fox) to win." Even if he is exaggerating, it's clear what his opinion of his play was.
Here, just for you I'll watch the match and point out how m2k was playing badly (the reason I didn't do this, is because it would require going through an entire match, not worth my time):
M2K's first stock: His spacing is plain terrible. I counted 4 times he straight up stayed within sheik's range on either her fair or bair, without having a move already out. Sheik's moves comes out faster, so someone playing well would hardly fall into a range he can't win in 4 times in the same stock. Additionally, he fell for the same trick twice, consecutively. He simply held his shield up while overtriforce ran in and grabbed. The first time he might not have been expecting it, but at that point normally he'd be alerted to it. The second time he found himself in the same position, he could have done any number of non risky things to avoid it. M2K playing well, or even on his average level, wouldn't make that many spacing errors.
M2K's second stock: M2K messed up a crucial edgeguard, misjudging the spacing/timing on a tipper. To make things much easier, he could have daired for the kill. Once again, m2k is one of the best players about making the right move to kill (look at uptilt-->dair which he essentially coined) and I hardly think he would make that mistake on a normal day. That stock he literally also ran straight at overtriforce twice, and got hit both times. There was no prior situation which might cause him to do that, no previous dashdancing, or any attempts to space aerials. He literally ran straight at overtriforce twice, and got punished for it. Hmm, one of the top 5 players in the world... is that sheik beating marth in the matchup, or is that m2k being off and misjudging the same sitaution multiple times.
I would go one, but that's already wasted enough time. That's also only during the first 2 stock, he still has 2 stock of mistakes and bad plays to go through. Honestly, anyone who watches that match and says "m2k played well" has no idea what they're talking about. Every comment I made was just at a glance going through the first two stock, without rewatching anything. If I can notice that just at a glance, I hope any competent smasher could see that m2k wasn't playing even close to his standard level.
If that's not enough proof for you, watch the match yourself, and actually pay attention to details. Might I add, I never even suggested m2k played fine for the rest of the tournament, but you seem to think I did. I would have to go back and actually pay attention to specific matches to see if m2k played well overall or not. Regardless, it's clear he played particularly badly that match.