I agree with that. DLC fighters, for three of them, brings new gameplay, and the other two brings a small gimmick (Banjo side special and Byleth bow).
I didn't want Byleth, and I'm meh toward them, but they have the benefit to break one more rule: the third party pass.
I'm conviced, for this second pass, we will have a mix of first and third party. However, on the first party part, as DLC and until now, we add 3 veterans coming back, a plant that was probably supposed to get into the base roster and only put in DLC because of time restraint, and 2 clear promotional picks. If the trend continues, first party DLC will be promotional picks too. But the recent games do not bring potential picks that I feasible easily and fairly in Smash (Howard, Spring-man) or that bring anything really new (Rex).
If they, instead, are going for "highly requested first party", I don't see a lot of them too. I don't see Bandana Waddle Dee and Dixie bringing much to the table. Waluigi is a mixed bag (maybe if they are giving him "cheating" machanics). I'm certainly biased, but if there are first party newcomers, I see first and foremost Elma, Isaac, Advance Wars rep, Rhythm Heaven rep and Paper Mario coming in, in all cases if tied with a new unannounced game. All these five contenders can bring a gimmick:
- Elma: weapon switching and skells
- Isaac: elemental attunement and/or djinn management
- Advance Wars: I don't really think of anything that can work to bring something "strategic" in Smash, but Fire Emblem cast got a counter to represent that. Sakurai would find something.
- Rhythm Heaven: rhythm can mean precised inputs
- Paper Mario: the "paper" thing is full of potential for gimmicks