When it comes to the finale, I think that Rangers are capable of beating Frankfurt and winning the title after. Rangers are this much close to the Europa League title for the first time. They have never reached this stage in the tournament before as far as I know. Therefore they should be benefiting from this big chance in an effective way. They are performing really strongly and they can win this too. They just need to be more aware in their defense as Frankfurt are a good attacking team.
Frankfurt is a very solid team, they have a lot of history and for now they have a fairly strong attack, so much so that it reminds me of the Brazilian teams, this means that for the Rangers they must be preparing the best strategy to face them and be able to beat them, although nothing is written in football we don't know how Frankfurt can come out, what it has the most weakness is the lack of a good defense, but I think that if they focus on the good counterattack they will be able to have more success, this type of team can give surprise when they usually give a ball and look for a header to score a goal.
For me, Frankfurt will be the defending champion and that title should be given to them, I don't see another reason why it shouldn't be called that, this is something that has to be respected, besides, everything Frankfurt did to get here is not disgraceful, it took out the best teams out there at the time.