ESA Application - JSA fallback

I am about to apply for ESA and would like help on 3 questions please.

1. If I apply by telephone, is this instead of completing/sending a Claim form ie. do they take all details over phone and you then send Fit Note to them and await receipt of the ESA50 Questionnaire ?

2. I got the Fit Note yesterday for 2 months but bit concerned about Comments the doctor added to it (condition is Osteoporosis/Osteoarthris by the way). It wasn't my usual doctor; when I explained I needed to try for ESA for the moment, but hoped I could work again in the future, she added "Would like assessment for possible work that she is able to do in the future".
I was not happy that she included this as feel it may jeopardise my chance of getting ESA. (I am hoping to get in the WRAG, as know I won't qualify for Support Group. When I looked alarmed she said she put it because that's what I had said (so much for honesty being the best policy).

Chances of getting another note instead are remote I think until after the 2 months.

Will this go against me ?

3. Does the 13 week Assessment period count towards JSA entitlement if I am unsuccessful with ESA, ie would I only have 13 weeks left of JSA entitlement?

Many thanks.

If my recent ESA Application is unsuccessful, will I be able to claim JSA instead? Will the ESA application be an obstacle ? (I am limited but could consider work of some type).

Not wish to be negative but don't want payments to dry up after 13 weeks, without realising this may happen.

Thank you.