The general NPC aggro in a non-wormhole, and a non-incursion situation is as he suggested. The original NPCs generally do not switch targets after they have one. However, their more newer NPCs in the Wormholes and Incursion sites are vastly more challenging.
I used to run 5 drakes and i had 1 toon in a Salvaging Destroyer, and just warped him in after or near the end of the mission, and just did another mission and salvaged at the same time. But, if you are T1 fitting a drake then that may not necessarily be a bad idea.
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