You are worrying more than I need to.

Now that this is out of the way.
So what if you are the last on the road (and you won't be because some other team is going to have a crappy swimmer and send their cyclist off much later than yours).

There was a tip a while ago - to estimate if you are out of your competitor's "draft box":
If you are going at close on 19mph - you need to be able to say "non-drafting rule" in your head before you pass the same spot as the competitor before you (actually it was a 5-syllable word but the tip came in german).
If you're going more like 15mph, you have to be able to say "triathlon".

the race marshals will give you a first warning. usually.