Endeavor/Pinnacle/Mesaba does have the right to hold back 3 months. It's a fact and I kinda think they will do it.
143 furlough returns (if all show up) and 7 Compass pilots will take up the first 3 classes of 50, then 20 Compass pilots per class til the middle of the year. It gets sticky if Compass does hold back pilots 3 months, leaving their slots open. Does that mean the Endeavor pilots get the next crack (which also may be held back), and then street hires

This holdback does leave the possibility open for off the street new hires in the earlier classes next year.