Should have countered with...
Hybrids make full driver wage, benefits, 9.5 and all other protection, can not displace regular drivers, can not cover vacations, and will not exceed 10% of the center workforce except for peak. If regular drivers are laid off they can bump hybrids, even on days which are not a regular driver's shift.. All overtime and extra work needs to be offered to regular drivers before hybrids.
Hybrids are so UPS can be flexible, cover weekend work etc. Hybrids should in no way displace regular drivers or their work.