The reason why I say I wouldn't be keen on Broja coming back comes down to:
1 - £30m. I think there's as good/better (for us) out there for that money.
2 - I just don't think he and Ralph click. There's ample evidence suggesting that, and on that I think there's a smoke/fire collaboration...which is also why I think that...
3 - ...there is the hint of an attitude issue there. Like a Diet Dele Alli...which is also why I think that...
4 - nobody else has come in seriously for him, despite him now being a PL experienced goalscorer, despite the fact pretty much everyone and anyone wants one of those right now. And also why I think that one of the most desperate clubs for a big, bustling number 9 right now, namely his actual club, Chelsea, aren't really playing or considering him.
Of course I may be completely wrong, but I have my doubts as listed above.