Trigger... (Note: COMPLEX (to you anyway
).)
1. Center Location 1 on Reaver 1 (head)
2. Give Reaver 1 to another player.
3. Center Location 2 on Reaver 2.
4. Order Reaver 2 at Location 2 to Location 1.
5. Center Location 1 on Reaver 2.
6. Give Reaver 2 to another player.
7. Center Location 2 on Reaver 3.
8. Order Reaver 3 at Location 2 to Location 1.
9. Center Location 1 on Reaver 3.
10. Give Reaver 4 to another player.
11. Center Location 2 on Reaver 4.
12. Order Reaver 4 at Location 2 to Location 1.
13. Center Location 1 on Reaver 4.
14. Give Reaver 4 to another player.
15. Center Location 2 on Reaver 5.
16. Order Reaver 5 at Location 2 to Location 1.
17. Center Location 1 on Reaver 5.
18. Give all Reavers to the original player.
Now, I hope you can understand how that works. It looks like a lot but it isn't. You can keep the head Reaver player owned and screw with the center locations and such, and it should work. Just change some owners. Make sure the non-head Reavers can't build Scarabs, or you can add in "Modify Unit Hangar Count" triggers to set them to 0 as the locations center.