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You summed up the major weakness of Deathwing Knights-their lack of a good delivery system. Using them with Ravenwing is not a bad strategy, but it does potentially suffer the problems you mentioned. You can eliminate the uncertainty of when they arrive by using one of the Deathwing formations (DW Strike Force or DW Redemption Force), but you then have to take an HQ and at least one other Deathwing unit (of course, if you are going RavenDeath as your army this is not a problem at all!).
If you are running a CAD, you might just want to go ahead and take a Land Raider for your DW Knights. If so, make it a Redeemer (less points) and include Ezekiel and perhaps a PA Interrogator-Chaplain (take a LR Crusader instead and you'll have room for the Interrogator to take Termie armor) as a nasty, if slow, deathstar unit.
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