Admittedly, I haven't played B209 yet, but how are the developers going to address this exploit?
Onos is close to dying near enemy base, runs around the corner, and quickly devolves into a skulk just in time to receive all of his spent resources back before death. He can now go Onos again after respawning.
Implement a short delay before resources are returned? Increase skulk evolution time? No resources returned if health is less than X%?
See you in NS2!!