Change in the position 1 is pretty normal when the season is in and everyone is aiming to get as much as DPC as they can to qualify for the TI.
In fairness of 23savage, he's doing well and made Team Talon Sports doing good. SEA is really a tough region and anyone on that region can dominate.
But AFAIK, it's Boom that's dominating and is on the top.
Boom definitely is on the top same with Fnatic. T1 is still adjusting on Gabbi playstyle or the other way around because they it's noticeable everytime they have new team opponent. Gabbi as carry has an inconsistent farming which his team mates usually suffer if ever the enemy tram get there item first. No doubt to Karl as solid mid lane but the rest of the team is having a hard time to synchronizer there game play to Gabbi tempo on the game.
There's only the top one, Boom is even defeating Fnatic so that's the reason why Boom is at top 1. I have no problems with Gabbi with his farm, I think he's better on that and very adjustable. It just going to depend on the playstyle as a team.
Look at Boom even though there carry is not consistent too. The other player keeps giving him space for farm especially yopaj that always dominates his lane or atleast create some rotation to catch enemy attention and pressure them to react away from the position of carry farm site.
Jackky is a consistent top carry IMO.
Talon is a good team which just needs some improving on the support department. 23savage lifts up the team, though you can't deny that forev's coaching also helps them big time. Also, kpii is already a veteran that knows the ins and outs of dota 2, and just needs some reliable team mates to convert his experience to some wins. But yeah, BOOM is the undeniable kings of SEA right now, and many other teams in the region will surely try to dethrone them as TI slowly approaches.
23savage really did a good addition to the team and they're having better results. 2 Indonesian, 2 Thais, and 1 half Chinese-half Australian. This team is really doing good on the Division 2 and I think they'll be the other team that shall reach Division 1 soon.