Morocco odds are slowly going down, which doesn't make sense... injuries, tiredness... but I suppose the goalscorers are what bookies think will make the difference. Or maybe rest of the world is betting on Morocco?
It's football gerrymandering and money...
There is some OK level teams in Asia which currently don't qualify to World Cup and would benefit from expansion of tournament. Uzbekistan, UAE or China for example. They're better than weakest UEFA teams. But they would struggle against mediacore UEFA teams. Kazakhstan example shows it well - they never had real chance to qualify to major tournament through UEFA. Considering extra WC slots for AFC, I wouldn't be surprised if they will consider to return to Asian confederation.
Yeah, it's generally higher-quality when your national players play in better quality clubs, and AFC clubs are very weak in that respect outside of the ones you already know have deals to train with clubs outside, better infrastructure etc. I still think the it's sometimes a different proposition when national teams who play together a lot play against better ones that don't train together a lot.
Also because of formats, shorter tournaments like WC do benefit the underdog more -- a small sample of games, get a team overperforming for 2/3 games and you get out of group stage at the expense of one or two big teams.