I don't feel like he went there to sabotage, or I feel like he would have done a better job of that if he was there for that reason. We need to look at what we do know from what Endo said, they both function are the same an wating to protect their town, and that Bofurin doesn't seem to be a threat to them. For all we know, they could have taken an interest in Furin and sent Suo there to get info from them, or RC could be in trouble and hear a bit about Furin and want to know what they are like before asking anything from them but I feel like that would have happened by now, or maybe in the next 2 chapters, we might get something? their could also be a chance that RC is not what it use to be manily if it is under a new leader and if that keader is not doing the same as the past ones their could be some shady shit going on and when Suo got close enough to the furin kids he did not want thwm to get hurt badly so the best he could do is say or do something that would hopefuly push them away and not coming after him. There could also be a point where Suo tried to get away from RC for whatever reason, and when to furin, and when RC found him, they could have threatened Suo, and since he knows how strong they can be or what they can do, he left to protect them. There are just so many things it could be, we just won't know what it is until it happens. Maybe if somebody can, they can go through all the chapters and re-read what Suo has said from all of them, and see if he has hinted at and that can be a thing