The DS = the 7th generation of gaming (current still, but it is almost over)
The 3DS = the 8th generation of gaming (the current/new generation)
Also, Starfy's games are both on the GBA and DS, so these rules in this theory do not apply to Starfy.
Well then Zelda should stop being a terrible character. That would be a nice change. That is also why I expect Zelda to not be shown for at least 4-6 months.
And yes, there would be more Shelda players. There's a bit in Brawl and a bit in Project M, and they have been effective despite Zelda being relatively weaker in both.
Really, the problem isn't Sheik, it is Zelda.
I find Zelda to be plenty competent when alone in P:M. Her new toys certainly make her a lot of fun, and she can certainly capitalize on her Zoning, Spacing, Okizeme, and Pressure game if you focus on what she can do. I actually really like P:M Zelda, her teleport, Nayru's love, and fireballs are amazing at doing what she needs and racking up damage and creating mind games. She lacks a bit of power in her Smash Attacks, but like I said, replace transform with a "Magic Charge" like PM Lucas and she's set, easily a mid-high to high tier character with that. I would totally main her competitively if so. Even in P:M I'd main her competitively just look at this ****:
My only gripe in P:M is that Transform was kept for tradition's sake when it's not necessary at all. It's a waste of a move, and a huge peeve if you miss and input, as it means transforming into Sheik and FORCING to change your strategy, or wasting time to transform back. Zelda needs to focus on what Zelda can do best, the two cannot work properly in synergy, half-zoner/half-rushdown is too awkard of a polarity for a transformer as they are opposite playstyle with comepleltly different strategies. Plus, Sheik doesn't need a Zoner half as she has plenty of Mix Up and Spacing moves with the Chain and moreso with the needles.
The NEED to be seperated, as BOTH would benefit hugely form the extra move and not having to depend on one another anymore. If we split Zelda from Sheik then Sheik can get a good stealhty approach options, something like Eddie's "shadow" move, you know, where he disappears into his shadow to strike from the unknown? And Zelda gets her much needed power boost.
Making them work together is too much of hassle and it means re-inventing both characters so they work together properly.
Once again, look at Val in BB, his two halves are "Combo focused Rushdown" and "Power-focuses Rushdown" and they work perfectly as he can transition from one to the next using his wolf form to approach foes and string combos. Shield will NEVER be able to do that, best give that option to Mewtwo instead.