Outbreak festering strike question

when i reach level 85 i plan to raid, so this question im asking will be directed towards raiding.

would outbreak replace the usage of plague strike and icy touch when tanking once epidemic is at 3/3?

does a tank need to use festering strike at all?
In blood the CD for outbreak is 30 sec, the same duration as your diseases. You may still find yourself manually applying diseases when moving through pulls quickly, but most of the time, outbreak has you covered.

No festering strike

In blood the CD for outbreak is 30 sec, the same duration as your diseases. You may still find yourself manually applying diseases when moving through pulls quickly, but most of the time, outbreak has you covered.

No festering strike

thanks :)