In fairness, the majority of County fans predicted exactly what you've said, and so far it's come to pass.
Thing is, as we all know, footballers sometimes just need to leave a club. I don't think we can be too smug re Arquin when 1) he hasn't scored yet and hasn't completed two games and 2) Gowser and Harkins seem to be faring so well at Dundee. One man's waster is another's star signing. Sometimes.
It'll feel like a sore one if we start to pull away from you and he continues to do well, but he was clearly at the end of the road at Dingwall no matter which way you cut it.