I posted a long-ish post about it at the time when Alex got promoted so I'll just copy paste the part of it re: Albon vs Kvyat:
"Also it doesn't surprise me one bit that Red Bull are putting Albon in the car instead of Kvyat for the rest of the season. They already know all they need about Kvyat whereas Alex still is a bit of enigma and this is a perfect chance to compare all of their drivers in order to make an informed decision for 2020. If Albon performs better than Gasly did, he should get the seat next year. If he performs at the same level as Gasly did, Red Bull will know they have to look for another driver for next season. Gasly was miserably slow in a Red Bull, Kvyat wasn't convincingly beating Albon in a Toro Rosso despite having 4-5 years more experience in F1; it will be very interesting to see how they do against each other now. "
Kvyat is just filling a seat at Toro Rosso until one of the Red Bull juniors is eligible for the Super License and makes it to F1 anyway. A bit unfair to him as I also think he's a good driver; that's why I think he should be looking for a drive outside of RB/TR in the near future.