Oh, I had a good question that I just thought of! What was bro!Ryder's first opinion on Jaal when he woke up and saw them together? How long did it take him to warm up to Jaal?
Scott met Jaal when he was still in the Hyperion med bay, going through some post-coma physical therapy. He was fairly well on his feet, but it took him some time to get his body to adjust to physical activity without tiring himself out.
Scarlett was in a relationship with Jaal by that point - a detail she had neglected to mention to Scott, as she figured it was better to explain that bit once the two of them had a chance to actually meet.
Given that he still hadn’t seen the outside of the med bay, this was Scott’s first encounter with an angara - made all the more confusing when the very happy smiling giant squid man gave him a hug that was more than a little too tight and started beaming about how glad he was to finally meet him, how much Scarlett had told him about her brother, and how relieved he was for both their sakes that he was well.
So Scott’s first reaction to Jaal was essentially shooting his sister a look that said “who the hell is this?!”
Scott and Jaal still don’t really know each other all that well by the time Andromeda’s main story draws to a close. Unsurprising, given that he’s only briefly seen his sister over the course of the game and spent most of that time stuck in recovery. So as of right now in the timeline, Jaal still kinda falls into the same category as pretty much every one of Scarlett’s boyfriends or girlfriends in the past - as long as she’s happy, then Scott doesn’t feel the need to involve himself in that part of her life. Jaal seems nice enough. A bit enthusiastic, maybe, and not the sort of guy Scarlett usually goes for - but he clearly loves her and she seems to care about him.
Time will tell how long it will take for him to really warm up to Jaal or truly understand that the alien now sees him as his own brother because the angara take dating very seriously. I don’t think it will take long, though. The largest barrier between them is cultural, as Scott hasn’t had nearly the same exposure to the angara that Scarlett has had.