"Yes you can withdraw full amount standing in your account even without the employer signature.
For Full Knowledge: https://www.indiantaxupdates.com/2013/01/02/how-to-withdraw-your-provident-fund-or-pf-in-india/"
-I partially agree your (above) point. However, you should know your PF number, Employer PF number with Region, Joining date and last working date with the employer (normally we know DOJ & DOL dates but still you should know whether your employer has reported the same dates with PF office.
Also, you have to either fill FY contribution (your contribution + employer contribution per month) in Form 19 or have to attached form 3A which has been issued by your employer.