A few comments:
1. with this set up GLAs will be missing 2 of their traits at a time, other classes don't have this issue
2. your version of Hallowed Ground is weak for a 15 min recast. Sentinel is a 50% damage reduction with increased enmity generated for 20 seconds on a 1.5 min recast. So, I prefer the version of Hallowed Ground we have now.
3. I don't think GLA will be getting DRK, due to GLA abilities and they might follow the FFXI route and give DRK to a scythe class.