I'll go on record and say he's the most underrated player in NA history and if I had to make a list of the top 10 greatest top laners in League of Legends history I would place him in the top 10.
The problem isn't about skill for Dyrus as we've all seen Dyrus do some incredible things in his career but more so being "uninterested" in games and overall, his career. I CAN'T find where I saw/heard/read but I remember Dyrus himself stating that he didn't actually try until around 2014 Summer in which he kinda wasted a decent chunk of his career 2011-2013/2014 being very unresponsive.
Dyrus being left on an island isn't really something new for top laners and there seems to be another league player that gets left on an island countless times and yet, he tends to make huge plays from being on the disadvantaged side of things(Soaz) So, the argument about being left alone to be a + in an argument in his favor isn't being noted. However, the system he's been in for his whole LCS career does bring some light to his side.
Long story short, if Dyrus was actually responsive in his career and instead of being monotone and agreeing to everything Bjergsen/Regi has to say 24/7 and had some backbone and tried, then yeah, I'd place him higher but as of right now he's around 10th and that's only because of his name value honestly for me.