Getting Devcon back in his life probably does worry Smokescreen just a tad since he and his brothers didn't precisely get along.
Devcons tensions have already been discussed but he also always viewed Bluestreak as an irritating little kid. And when he was on the ark he viewed both of Smokescreens brothers as holding him back from doing what he wanted. Namely leaving with Devcon.
Buuut his time away from the ark as a lone bounty hunter, associating with his non-cybertronian allies, and dealing with the antics of the Lambo twins probably got him closer to understanding why Smokescreen was so unwilling to leave his brothers.
There's still tension when they reunite. Especially regarding Prowl.
The second Smokey's sparked tho they're all forced to work together. Plus, along being present, smokescreen does make at least trying to get along with his brothers a requirement for their relationship. They don't have to be bestest buddies or anything, but he needs Devcon to understand that being with him means involving his brothers.
He probably ends up loving bluestreak lol prowl not so much of course but jazz? He loves jazz who doesn’t? But that means more time around prowl which he doesn’t like BUT prowl thinks its hilarious lol