Hmm, no, it wasn't entirly necessary. Certainly not when I watched it, at 10 in the morning.
This is true. Un-cut version plus the scene with Jack and Daniel, but it was something of a shock. I mean, they cut ER repeats at that time of day!
On the other hand, it perhaps was there for the shock factor. The female soldier was one thing, but you knew who Sha're was, and so it might of made more of an impact having the implantation as it was shown.