Whilst running a Spirtbonding grind session at Urth's this morning, me and a fellow LS member were discussing (or rather he was telling me) that having more than one party member affects SB gains. In fact, this person claimed that it was the reason for not bringing out his Chocobo. So, is this a matter of fact? If I have a Chocobo out, or join a party, am I partially nerf'd for SB gains?
If you know the answer, please cite the source (e.g. patch notes, dev clarification, etc.). I'd like to clear this up - running without my Chocobo in crafting gear as a PLD yields forever-long low DPS.