If we can sign Rabiot for a reasonable sign-on fee and similar wages to what he has at Juve, I think this would be a good addition to the squad. We know that we need to strengthen the midfield, but we also know that we cannot fix everything in one window. If Rabiot in means that we can sell the likes of Casemiro and Eriksen, I think we will be far better off. We would still have to bring in another DM or two, though.
I think the INEOS strategy of signing younger players, is mostly related to the high-profile signings with high transfer fees and/or stupid wages. So we would hopefully not see more of splashing huge fees at Casemiro, Varane, Alexis Sanchez etc. at massive wages, but maybe utility players at free transfers with moderate salaries.
I also thing Guido Rodriguez and Mario Hermoso would be excellent candidates. If these types of signings allows us to shift players like Casemiro, Eriksen, Maguire and Lindelöf, strengthen the squad, and allow us to spend big on younger high-profile signings, I am all in.