avila is totally to blame. its not that the tanking was bad, because the tanking has brought them top prospects who are heavily predicted to be good players.
the problem is that - other than skubal - there does not appear to be a lot in the system to help. and that's on avila who has been in charge of drafting for the last 5 years and was heavily involved in the process before then.
this is 100% on al avila and the tigers' inability to draft and develop talent. with all that said, they seem to be moving in the right direction finally in the last few years. it may just be too early to see results from that (which is not to excuse his earlier failures).