The things LB should have are:
1) ability to make shove from neutral (like gryphon).
2) HA on his top heavy unblockable.
Everything else is more than fine.
3) maybe: ability to feint longarm into light attack which starts the chain. To catch those who dodge. Also make it coming only from one side. If you guess correctly - you will have a light parry. And get a free heavy. Or dodge and have free gb->heavy. If you are wrong - you eat a light or a heavy.