I'm sure yahoo62278 would be the first to confirm I was in multiple signature campaigns on and off for about eighteen months.

Yahoo might even conceded that identifying alts is beneficial to campaign managers who enforce a "no alts can participate" policy in many of the campaigns. Even the now disgraced chipmixer campaign attempted to enforce participants from various regions of the world so again establishing whether there are alts in a campaign is crucial for campaign managers (just as an aside three high profile users we're found to be alts in the chipmixer campaign simultaneously when it was paying out at it's most lucrative)

Having said that a campaign manager would undoubtedly see the *neutral* and keep it in the back of their mind, but, until you apply and are rejected and ask respectfully why you were rejected then told it was the neutral then this is all hypothetical conjecture at best.