Voltron: Legendary Defender - Shiro and Adam

I don't have a long write up for this or anything, mostly because I'm just confused...

I have to admit, watching season 7, I don't remember Adam if he was ever brought in before, and his part was so short and seemingly inconsequential, I honestly have no strong feelings for it. Shiro is all about burying his feelings and putting the needs of others above his own, so it's not at all out of character for his personal life to basically never show up. Still, we're finally getting more of his backstory, and I can't help but feel it's lacking.

So, I guess my question is - why? Why bring in a character they're not going to develop and kill off screen? Would it be better just to have a random mention of Shiro being gay and just moving on, which I guess is pretty much all that happened anyways? Guess they could have done it as part of his backstory with Keith. Does this count as queer-baiting?

Thoughts?

Correction: guess he didn't die off screen. I just didn't recognize the random pilot as Adam...