The great West Indian team of the 1970's and 80's used four fast bowlers only because it lacked a quality spinner. However successful this team was, on certain occasions the lack of variety in the bowling attack was clearly a weakness. Clive Lloyd, who is a first cousin of Lance Gibbs and played alongside him in the WI team for many years, certainly recognized the value and importance of spin. (Lloyd faced, among others, Bedi, Chandrasekhar, Underwood and Abdul Qadir in their prime).
Sobers, whose most effective form of attack was fast medium bowling, is not a bowler who should be the principal spinner in an all-time team. I would expect him to bowl seam most of the time, reserving his chinamen and googlies for occasions when the team needs to buy wickets and runs are no object, and bowling orthodox slow left arm (as the second rather than the primary spinner) mainly if not exclusively when the conditions favor spin.
It may be too late to matter but for what it's worth my vote for the bowlers would be: