They already have Kopech on the roster, they're not going to pay another $21+ million to add all the variability that comes along with Thor.
Right now, they need to be just as concerned with getting to the playoffs as building a WS winning team.
At best, they can afford one big add, but it's most certainly not going to be two...especially if revenues are down from somehow missing the playoffs.
(Talent is much more likely to come via trades, which is a scary proposition with this current front office.)