Originally Posted by LIT LOVE

When you file for Reconsideration, SS can potentially deny the Approval you were just granted. Very risky, and I wouldn't recommend it.

A few years ago SS changed the rule that allowed people to start a second claim while pursuing an appeal. It forces applicants to lose backpay if they want to get out of limbo while waiting for a decision for months or years. I believe your advocate is giving you bad advice, since this rule won't allow you to use the original Alleged Onset Date. The earliest date possible would be when you terminated your first claim--this would have been by not submitting a timely response to the last decision you received or by filing the second application.
You can confirm how your Alleged Onset Date was chosen by contacting your local SS office.

And yes, your advocate is looking to hike their fee. As wonderful as backpay is, the monthly benefit is more important in the long run.

BTW, does your decision say Fully Favorable or Partially Favorable?