He was a monster. But doesn’t 100% fit OP’s criteria.
The pros:
He played several seasons in offensive positions, before establishing himself as a world class left back. Started as striker in Brazil, but allready there got used on left back some times and it went well enough that he got on the national team. Moved to Inter Milan where Roy Hodgson used him (somewhat succesfully despite the team having a bad season) as winger. But since his position on the national team where left back, and he didn’t have any (immideate) chance to get minutes on the offensive positions he asked the club owner to force the manager to use him as left back. Instead they sold him to Real Madrid with them promising him to use him on left back position. He was as good offensive (if not better) as he was defensive, and he could quite easily be put on any position on the field, but one, which brings os to…
The cons:
He would be a bad center back alone for the fact that he is only 1.68m tall, so he would loose all the headers. He physique was also more centered around speed and agility (and stamina) so opposite of what you want in a centerback. The same cons would limit him as striker, in which he would have to be in a formation with more strenght/height/header types to succed/compliment.
The reason I agree with u/LordXavier77 is that in all the Messi/Ronaldo years, there have been better players than Modric. Xavi+Iniesta just mention the most obvious, both had better years throughout that period, than Modric did in 2018. Both in terms of individual perfomances and team-trophies. So it was political that they decided that year to exlcude Messi/Ronaldo - it would have been more deserving at many other years to give to others, for instance Iniesta in 2010, just to name the for me most obvious. They gave it to Modric because he was the best for Croatia which were the biggest overachievers at that WC. Nothing else.
In regards to the CL 2018 win, which is the main other merit mentioned besides the good Croation WC; in the whole campaign he scored once and assisted once. 0 of them where in 2018 (all the later stages). He had Casemiro and Kroos to handle the defensive/box-box duties and his main role were creating chances. He was good. But not french baloon good. In that campaign Kroos, Ramos and even Ronaldo were better. And in the league Kroos was a monster. It just seems silly that they almost solely give the trophy to the best player at the WC in WC years - there’s another throphy for that!