Would a 71 be a huge aggro magnet?

So I started leveling my DK and ran him through Outlands and went to Northrend at 68. To make sure my priest on second account got geared up as well, I grouped them and quested together. I find myself in a dilema as my DK is my main and I want to get him to 80 ASAP, work on professions, imstances, etc. My priest is just there to heal me when I need for questing, dailies, etc. I want to eventually level up my Priest (2nd account) and Warlock (main account) to 80 so I thought since I have played Priest/Lock together for nearly 4 years, why not level them together and just PL my DK for now and then use him solely for instances, etc.

Now the question is, do you think I should keep my priest around to help with quests? Will he be a huge aggro magnet as a lvl 71 when my DK is in lvl 76-80 zones to the point of him slowing me down and being a liability or am I safe enough to do so as I did when TBC hit and I ran my lock to 70 and then leveled my priest from 62 to 70? Thanks for your feedback, good luck on the leveling!

Only give the priest the kill quests you can easily complete.