You really are over-thinking it. At the end of the day if you're going too hard you'll overtake the guy in front if you're going too easy you'll start to drop back. Keep an eye on the watts and your position and that's all there is to it. On the tron bike if I'm right behind someone I just assume I'm in their draft - and take it from there. Whether my avatar changes position or not genuinely doesn't make much difference to me.Definitely a few grey areas isn’t there!
I think you can argue the tron bike either way. One way is that it stops you thinking about whether or not you’re in optimal draft as there are no visual prompts. But on the other hand you could potentially be using loads more effort than you need to be as a bi product if that. If you think about it it can make a massive difference at the end of a race. The same as taking less turns, if any at the front can. Or if you are taking the same turns as someone else but he’s conserving more effort through better drafting skills.
Either that or I was rubbish at drafting anyway and the tron bike doesn't make it any worse - yeah, probably that!