WG13 has it right.
If you do anything long enough, you get pretty good at it. So after 2 years instructing, you are much better than the B2 you were. If you aren't, then you need to hold yourself up to the light. There are blokes who don't achieve A2 at the end of an instructional tour, despite having been single seat background. You may be a 4-ship lead, but that doesn't mean you'll be good at helping a young shaver through the sticky patch that most of us encounter at some point during our long road to whatever cockpit we end up in.
Horses for courses and all that.