What type of thoughts are you seeking?
The Certification is nice to have if he's selling the ball. Obviously it's quite valuable if authentic, and most potential buyers would want a Letter. I would stick with PSA or JSA (as the two most valued opinions).
If he just wants the Certification for himself (and is not selling) then only he can determine if it's worth shelling out for the authentication fees. If he has any doubts about the signatures (or thinks some might be secretarial), then perhaps he should have it done.
Not sure if this helps... just my .02
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