Even though I think it is pretty obvious arsin=precise=precise2 I noticed they were both online at the same time and decided to see if I could see anything by monitoring each of the account's most recent activity. Personally, I find the results pretty conclusive.
arsin
2.09 viewing other thread
2.10 viewing other thread
2.11 editing sig
2.12 viewing other thread
2.13 CP (cant remember what this was meant to symbolise to me - I was drunk)
2.14 viewing arsin/precise thread
2.17 replying to arsin/precise thread
2.19 replying to arsin/precise thread
2.20 viewing arsin/precise thread
2.21 replying to arsin/precise thread
2.24 viewing other thread
2.31 viewing other thread
2.39 viewing other thread
logged out with last activity at 2.46
precise2
2.09 viewing arsin/precise thread
2.12 viewing arsin/precise thread
2.16 viewing arsin/precise thread
2.20 viewing arsin/precise thread
2.25 viewing arsin/precise thread
2.31 viewing arsin/precise thread
2.43 viewing arsin/precise thread
logged out with last activity at 2.46
So, to me, it appears that he was logged in on the precise account and was keeping up to date on the arsin/precise thread with it and was using the arsin account to read the rest of the forum. Although when he was replying to the arsin/precise thread he never actually posted it.