No. It is not true. If you constantly get B or A for your performance, your CEP will be bumped up. A normal non-scholar teacher can also have superscale CEP. There are many non-scholar principals too.

Similarly, if the scholar does not perform well, their CEP will also drop.

Ultimately, it really depends on your consistent performance. A scholar may have a head start, but if you consistently perform well, you can get there too.

You must understand that the scholars have put in their efforts in achieving excellent results in the past. So, it is fair that they get a head start for their achievement. However saying this, it does not mean that a non scholar teacher can never outperform the scholars. In fact, there are many non-scholar teachers who are doing better than the scholars.