While I don't think he'll perform too well compared to all the ridiculously good rookie jg's we've had this year (contractz, spring split inori, the first week or so of Mike), comparing his success to dardoch in the next few weeks is a bit of a tricky thing. Although he had a bit of a terrible split, CLG losing their "aggression tool" should make things interesting as it's arguable that his aggression is what enabled certain players (darshan) to exceed expectations and play better than they have in a while. Meanwhile, DD is going onto a team who is probably going to be starting at least 1 other new player this week (potentially 2 if they go with godkwon again) and could very well not win a game for the rest of the year.
Ultimately, it'd be heavily close. If I had to take a stab at "solving" this mess I'll say that dardoch finishes with better overall stats (due to having to try and carry more games) but both will look pretty meh, assuming TL even starts him for the remainder of the year and doesn't go with piglet jg and arcsecond adc.