Banarep

I see what you are saying.  In my case they did.  Because I meet the 3 pillars.  I guess some file with no evidence (no pillars).  Auto denied, no C&P.  I stand corrected.

#1. Request your C-file in it's entirety first. It will take awhile (6months+) to get it which will provide you time to gather all your medical evidence. 
#2. File an intent to file.
This will preserve your effective date for retropay purposes.
#3.Gather pertinent evidence for sleep apnea. Request  the VA pulmonologist provide an addendum to her note to state "CPAP Medically Necessary" or an equivalent statement. You can request this through a Patient Advocate at your local VA.The va will deny your claim if that little piece of evidence is not present. 
Dr.Anaise, Dr. Bash, Ellis clinic do nexus of opinions among others.
I've researched VA Claims Insider and Brian markets himself and his company well. Apparently, he has a team of claims specialists, dr.s, and lawyers. 
But, so does comp&pen LLC out of Florida.
Use your own discretion on who you want to go with.
Some Dr.s nexus of opinions go for hundreds into the thousands of dollars.
But that depends on the complexity of your claim.
#4. Must meet Caluza factors for direct service connection.
1). Current diagnosis
2). In-service injury, event (diagnosis), illness.
3) Medical nexus stating the minimum threshold of "at least as likely as not (equal to 50% or greater probability) the claimed condition is due to or the direct result of military service. Plus, a rationale.
*****This is just a recommendation other experienced forum members have been dealing with the VA for decades and have a wealth of information.*****