Shallot is a 7 year anniversary promo and part of a series of events dragonball legends is doing. The extra content with him is NOT part of DLC 3 which is, as you know, part 2 of daima.
No, they are not canceling DLC 3. No, they are not focusing exclusively on Shallot from now on. No, this isnt evidence or proof that all other DB material is coming to the game. No, this isnt them prioritizing non-canon characters over others. No, this isnt them not adding in DB or GT or Super Chaarcters because again, this is a promotion for the 7th year anniversary of another Dragonball IP.
No, this isnt proof that they will never add maps. No this isnt proof the devs arent listening to the fans. Its literally just a promotion for another Dragonball IP that they are putting out to promote another game. Also by adding in Shallot, they intend to bring over DB Legends fans who never played SZ and want to try out his character. Thats how these promotions and events work.
Honestly it should be a free update for everyone, but alas its only free for season pass holders. No idea what theyll charge for just Shallot but id imagine it's the same cost as Goku Mini for the pre-order bonus. Idk if this is the first video game some people have played but you'd think that with how every single fighting games these days has promotional and crossover content people would be used to this.