is 31Q good enough for you? 21T is one of the faster trainers, so they say, but if you dont need the DL/DC then why bother. Like you said, you can easily purchase another 4* 18yo for less than 21T.

It is a matter of T and $ now. At lvl 4 I can remember the fastest trainers being around $4-5M, correct me if I am wrong if the most expensive 18yo is more or less.

In which case you save yourself $$$ and use tokens instead for a fast training, multi-position 18yo.

So you have to decide to waste tokens or waste money.

Good luck