I have done some tests of my own, for example: I requeened half a yard (16)
with and half a yard (16) without attendants, and convinced myself that the
attendants were not of consequence. Also,

from Apis-UK Issue No.12 April 2003:

researchers carried out experiments in Ohio, Quebec and British Columbia
over a period from 1993 to 1997. Their primary objective was to use
synthetic Queen Mandibular Pheromone (QMP), but they also experimented with
worker Nasonov gland pheromone. Whilst carrying out these tests, they
compared acceptance rates between two types of cages; a wooden Benton cage
and a plastic JZBZ cage, and with cages with attendants and without attendants. 

Even the best result using QMP did not improve introduction success rates at
a statistically significant rate. Success rates were normally in the region
80 to 100% and this did not change with the use of bee boost. Interestingly
enough, the use of higher doses of Bee Boost indicated a significant
decrease in queen acceptance. The experiments which used nasonov pheromone
also showed no statistically significant improvement in queen acceptance rates.

Statistically, there were no significant differences in the use of wooden or
plastic cages, and more interestingly, no significant differences in the use
of cages with or without attendant workers.

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