I also think this is the correct answer. Bandai have the SoC Dairugger XV coming out this month, next month aside from the VF-1S they also have the Metal Build Eva Unit 02 coming out. And on top of all this they also have a super expensive Nu Gundam which very high parts count coming out in December. All of which are highly sought after items that are much more complex to assemble.
That’s because Flame Toys and Bandai contract the same designers (Decomas Labo, Chemical Attack), same situation with Bandai and Arcadia contract T-Rex to design their Valkyries.
Hasbro has nothing to do with it.
For the record, the VF-1S had the most stock out of every item that went up last night at amiami (you can see their current stock through amiami’s api call). Some numbers I recorded last night.
VF-1S : 859 (+130 that came later)
Dairugger XV : 401
SHF Shinkocchou Seihou Kamen Rider Kuuga Decade ver : 483
Robot Spirits Gelgoog J ANIME : 614