no question about frost and sword. xenics, im not so sure they are on par. they are a really great team but something about them in their recent performances has felt off. i think its cornsalad tbh, i dont think hes adapting well to the current midlane meta. his assassin play is really his trademark stuff, but ori, anivia, and karthus are kinda just too powerful not to use them right now. though in the xenics game vs. shield today cornsalad did draw a ban for his kass, xenics couldn't capitalize off it like some other teams could since cornsalad isnt particularly strong in any of the op mids atm.
shield has been performing exceptionally as of late in the IPL qualifiers and have earned their place atop tier 2. in fact if we are saying xenics is tier 1 then i would put shield there too.
blaze is no doubt weaker since losing reapered. they will make it though group stage fine but could very well see a Ro8 exit. also apparently koreans only play kog and ezreal now, which i feel works against jack. i guess the kog love atm is because -50% attack speed from ez doesnt really do much late game when you're rocking +200% or more, but the kog lane is always against like ez sona or ez zyra. which leads to a really binary lane chemistry where one side always wants to aggress and the other always wants to stay back and farm, that seems to hurt adcs and supports who are particularly skilled and could otherwise outplay the opponent in an even lane. ofc with the ez nerfs next patch we could very well see the return of the graves dominated korean meta, which would favor jack a lot.
despite being an lg im fanboy i have to admit they havent been performing like they did in their team op days. unlike blaze though, i think the lg im team swaps will leave the team a lot stronger. cornsalad never really fit top lane and him moving to xenics was good move for all parties. i really glad that lilac is back top now because he works so much better by himself in lane and tbh he didnt really fit with paragon. paragon is way to passive a player to work with lilac. lg im should also try to avoid 2v1s as much as possible since those lanes are naturally aggressive for the ad and support which places paragon out of his comfort zone and constricts what lilac is able to do in lane. in one of their ipl qualifier matches they tried putting jarvan with blue 1v2 but blue buff ended up just being a huge please 3 man dive me sign. ring is super solid and mid king needs no words.
a lilac
i have to disagree with you about mvp whites placement though, they seem significantly worse than all the other teams you listed for tier 2. i dont know if you've seen stuff from them that i havent but every match ive seen from mvp white they've lost, and they were kind of stomps too.
if anything i would switch CJs and whites placement on the tier list. im not sure since i dont remember the names exactly but i think CJ has had some roster changes since ogn fall ( the guy pictured for ad carry in their most recent tourny is a lot fatter than i remember the ad carry in ogn fall being), either way their games in the ipl qualifiers have shown a lot of improvement in the team.
i dont really know about the rest... mvp blue and GSG (apparently RoMg?) were kind of pushover teams last ogn but apparently qualified again so we'll see. i have no idea where people have seen Rolster play before or why they are rating them so highly, except that Rolster is a BW team but that doesnt really mean shit.