Hero Revival

I'm having trouble reviving a hero for the comp. I have an altar, food, and money for the revival.
This is the code I used.

Trigger 1
(event)
Unit - Dalvengyr 0044 <gen> Dies
(action)
Unit - Order Altar of Darkness 0011 <gen> to Revive Hero Dreadlord (Dreadlord is a variable of type 'unit' equaling Dalvengyr 0044 <gen>)

Trigger 2
(event)
Unit - Altar of Darkness 0011 <gen> Finishes reviving
(action)
Unit Group - Add Dreadlord to Wave1 (wave1 is unitgroup)
If ((Number of units in Wave4) Equal to 2) then do (Unit Group - Order Wave4 to Attack-Move To (Player 4 (Purple) start location)) else do (Do nothing) (this assumes I have another unit added on to wave1)

Does the altar revive the dreadlord successfully?

If not you need a little 5 secs wait before the order, cause you can't order an altar to revive a here just after he dies , there is a small time that the altar takes to react.