I didn't post anything on the discussion, i didn't start posting until ~pg 70. you'd probably have to actually read a few of the posts
as for IDC being hard, that doesn't really matter. A common thing that comes up in melee is that no matter how difficult something is, someone will practice and do it consistently.
As for fox and MK being in the same game: i don't think fox would work at all in brawl physics. If he retained his melee physics, then yes he would be better than MK. and if MK went into melee and got a hitstun buff, fox would still be better. MK < Melee Marth
As for fox's recovery, its actually better above the stage. If you firefox 45 degrees above the edge, you have 3 options of recovery, but really 2 is all you need. In order to cover any of fox's options in that situation you have to full commit to it which is obvious to the fox and he can change his angle to avoid it. He can do the same thing at 30degrees above the stage and 60 degrees above the stage. At the same time he has disjointed fire protecting him starting at frame 20, which prevents most characters from hitting him unless they full commit off stage in which case its obvious to the fox and he can take evasive maneuvers like shine stall. If you grab the edge, his firefox has exactly 4 frames of lag (the same as landing on the ground without doing any move) so its basically unpunishable at the end.
Compare that to marth or sheik's recovery, all you have to do is grab the edge to force them to upb onto the stage then hit them off and repeat until they don't come back.