Some men just like to watch the world burn..
I also tend to say no to early surrender unless we have an open inhib with the score being <10 to >25. Some comps are really strong early, mid and late. However, the same can be true with team fights. Some comps have a tendency to outperform just "RAW POWER TOP TIER PERFORMANCE" level of champs. In your example it is riven. Riven is shot down via heavy CC. Using this you guys should be picking something similar to a thresh/blitzcrank support or having high peels supports such as janna/lulu.
Assuming it is the game from your op.gg where you played jax, the darius into riven was an unfavorable trade in this instance. If the darius was helped by you or camped to oblivion i'd be focusing bot lane to support pressure there forcing the jungler to choose topside or botside. If he choosing bot side, let darius counter engage on the riven (as we all know riven is a hyper aggressive-turret dive loving champion) then you just have to Q E into her while she's either under turret or darius is wailing on her. Just suggestions i'd make.