You didn't really watch Robertson at Dundee United then, did you? He was raw. Very, raw. Patterson is indeed miles ahead of him at this stage. Not just my opinion, but that of the Scottish international management, given that he wasn't capped until just before he left for Hull city, so I don't quite get how your assesment on how he was the best full back in the league rings true with history. Never said he was miles ahead of Tierney. Just the closest comparison to him to have came out of Scotland since. Albeit opposite flanks.
In respect of Simunovic. He's a player absolutely ruined by injury. It cost him his move to Seria A, failing his medical, a league you clearly hold in high estime given your thoughts on Hickey's ability and average showing there.
I have no vested interest in this move other than I think it's a great one for this club. Merely giving my opinion, and also a little insight into current stage, which I am party to.
You are welcome to your opinion.