Sorry I'm late to the game. There are straight forward answers to your 4 questions:
1. Yes.
2. If you plan on getting your ATP as a military guy, you have several choices when it comes to your commercial. The easiest is to simply bypass the commercial and go straight to the ATP. MIL2ATP has a MIL-to-Airlines package that is made for guys like you.
3. All of the CTP courses meet the FAA's requirement. But, Delta Airlines is now doing CTP at their pilot training center. MIL2ATP patnered with Delta when Delta was just getting The CTP started. So, why is Delta's program better? Once you take your ATP written, Delta will pull and score your job application. Again, this is new. But, the guys that have "pressed to test" have interviewed at Delta within 2 weeks of submitting their app.
4. Check out MIL2ATP's MIL-to-Airline course at mil2atp.com.