That seems like a strange assumption to make, considering the name implies they're a pair. Though I definitely agree the pressures to make the anime an even bigger promotion vehicle for the card game have been increasingly intrusive.
IMO, every generation they become a little more prone to one-shot their cards for the sake of promotion than they used to. Cards like Enlightenment Paladin or Nirvana High Paladin which even had some build up for them never appeared again. The Ancient Gear structured deck was just shoved into a character that had nothing to do with the theme for a couple episodes and he even dropped the deck by himself to go back to normal before said deck was defeated. Also, most of Yuya's Performapals were one-shot cards with the only unifying characteristic that they were P-pals.... but not all that many cards were recurrent. Sawatari even changed decks 3 times, the second which put him in a better spot than the one that'd come in next, and said last deck which would not shine until his duel with Zarc.
I'm sure the cards that weren't meant to promote current product were shamelessly placed to have something to give us 5 to 10 years down the road in some nostalgia-focused release a la Legendary Collection... Namely Sawatari's first one-shot deck, the Panther Warrior cards from that dude that never appeared again, or any of Sergey's cards (Earthbounds and that "50-shades of plants" theme xD )
On the theme of the two working together (the "Talker" duo of Links). I hope they do that. I'm sure at some point they'll have a bigger swarm, but Speed Duels don't seem to make it easy to make big enough swarms..... Now that I think about it.... in non-Speed Duels Yusaku won't even have an Extra Deck....
- - - - - - - -
I wanna be more faithful to VRAINS but I have very little hopes they won't do something like this again. Maybe I'm getting old for this stuff because Arc V's finale sunk low enough for me that it made me regain some respect for many aspects of ZeXal, and I didn't think that'd ever happen. I don't want to down the road feel like Yugioh has become comparable to something like Bakugan.... *shrugs* I hope VRAINS is enjoyable and smart....
I so far have very little issues with Speed Duels. I wish they gave more continuous abilities like the actual Duel Links game does rather than "once per duel Pot" or a built-in plot device. Which to be fair, Yusaku's ability doesn't give him any advantage since it's not a "draw" that gives him any pluses..... BUT he's gonna asspull from infinite Extra Deck toolbox pushed by plot convenience in the worst cases..... not that main characters didn't already do that with Yuma and Yuya creating their Ace's evolutions every time so w/e... at least it's not grabbing Action Cards so I'll take it lol.
Still, if only they had given him a more solid and tactical skill that worked with his deck's theme in interesting ways.
In Duel Links, I've seen some amusing skills. May Valentine has the right to look at the top of her deck's card at all times, and Tea doesn't take battle damage during her own turn, to name a few examples. I think the concept could have been much more creative than the skill he got.