First of all, congratulations for your post. Its really hard for a manager to find such a team in a big community and you posted interesting things to comment. Apart from that I always said it, there are lot of good managers on Spain on Div III-IV(ofc on I-II ;) ) but for different reasons its really hard to promote on competetive leagues.
I know both players, its by far the best SG-SF i've seen since season 4 on the youth spanish team. Of course im not going to tell their skills, but im really impressed this manager manage to train such a good SG-SF, plus he is training with a trainee level7 during all this seasons(im not sure if during this 4 seasons but at least, 2 think yes.).
About those who said: ''he is going to pay lot on salaries next season'' he wont at all. He trained really well so his salaries wont rise much, its the advantatge of training on a multiskilled way, you dont have to pay huge amounts of money on salarys so if he fail this season to promote he can try it next season with better conditions.
Also if at the end he decides to give up this strategy(from my opinion it can be really usefull, but it needs like 4-5 seasons thats over 1-2 years no?), he can sell both players the SG-SF to start a new team. I dont know how the TL would value them, but for me Bañales is a top SF around 8M and Franco can be valued around 7M without problem.
I really dont know wether if this manager will arrive to Div II, but im sure that he will manage to promote to Div III for sure and then depending on what league is on DivIII he can have chances to promote again.
Anyway thanks for your post ¡