Aftermarket starter left gap in flywheel housing

I bought a remanufactured LT4 starter - it was bad from the factory but I didn't discover that until after I spent the time to get it in and mounted. So I broke down and bought a Jegs ProStarter 555-10001 and just put it in. Doesn't sound any different or get my car starter any faster, which was a minor dissapointment, but no worries.

Anyway, after having had both the LT4 and the Jegs starter mounted, I noticed that they both left a small 1 inch by 3 inch gap in the flywheel housing. Is this a concern?
My car is a DD, and sees all seasons. Wouldn't moisture getting past the flywheel housing would be a bad thing?

See attached bad photo - area in question is circled in green.

http://i44.tinypic.com/de89jm.jpg

I'll probably mod something up, but what do you think of this issue?

A4 or M6? I've run a CVR Pro-Torque starter (which I think is the same one JEG's sells under their brand) with both the M6 and my TH400 with no problems. The M6 left the gap in the sheet metal dust shield, the TH400 has a JW UltraBell that is completely open on the bottom, leaving the flex-plate and the torque converter exposed.

M6, sorry about that.
I figured it's probably not a big deal for a strip only car, but what about one like mine driven through anything and everything?

When I had the M6, it was a daily driver. Never had a problem.