My last try... - WATCH THE VIDEO! How much more proof do you need?
You can see with your own eyes that Bobby sings it.

I don't know what is printed on the inner sleeve of the record but it's either a misprint or you read it incorrectly.

I have ears and I know Bobby's voice. It CANNOT be mistaken for anyone else in the band as BOBBY is the only one CAPABLE of singing that chorus in that key! Again, why do you think they hired him? Bobby handles all the difficult high tenor vocals. Africa's chorus and Rosanna are great examples.