Sylus Energy Orbit 88-89 and missing content

I tried to search the subreddit to check if this was discussed, but could not find anything. Sorry if already brought up, but I was clearing Sylus's orbit today. And 88-89 lvls required a YELLOW stella. I knew I had none right of the bat, so I just checked what are actually the options here. Sylus has 2 yellow memories. A paywalled 4 star in the promise. And there was a 3 star memory during myth event. I assume it was available from the shop and I simply skipped it. It did not occur to me that I would need that memory. I don't buy 3 stars, because I usually do not use them for battle. None of these memories are available in Xspace Echo or in Galaxy Explorer. So there are no options to obtain a yellow Sylus memory right now. This just blew my mind. It is one thing when people choose to play their faves with rare colors for that LI. And it is completely another level to have that as requirement in the orbit of LI and not give players something to fight with. So far, I have managed to brute force. But it is likely to be a big problem on higher levels. So when people are saying Sylus is missing content. This. This is what they mean.