Reporting your bags missing to UA is in fact the correct process. Fault is irrelevant to responsibility and the responsibility falls on UA as the final delivering carrier. If the flight details are incorrect in WorldTracer when you look online, call UA back and make sure that UA has the correct details. At the same tine, make sure that WorldTracer has a correct description and also a good mobile number for you.
UA will reimburse you for your reasonable expenses for necessities until your bag is delivered. Presumably you have the first 3-4 days of clothing in your carry on, so this may be a minimal exercise given that the vast majority of passengers are reunited with their bags within 2-3 days at the most. Keep receipts and when the bags are returned, total up the expenses and submit to UA along with receipt copies. You are covered up to approximately EUR 1,150.
If by some chance the bag cannot be located within 20 days, it is considered lost or stolen and UA will reimburse for the fair market value of the bag and its allowable contents up to EUR 1,150 (including the interim expenses you have run up).
You may find that your travel insurance provides more generous coverage, particularly if it provides a set amount per day.
When you trip is done and you are back home and depending on the reason for the original EW delay, you may be entitled to delay compensation of EUR 600 (delay exceeding 4 hours at your final ticketed destination of SFO). The reason for the delay matters and one presumes that you know that from your dealings at CGN.
Finally, EW is responsible for a duty of care no matter the reason for the delay. If you purchased a meal or somesuch, that and the train ticket to FRA should be submitted to EW (unless you have chosen to use the travel insurance route).
Forget about the training issues. It will or will not happen and you will not be told. It isn't up to you to worry about how EW runs its business. Rather, it is up to you to determine whether EW meets your standards and to avoid it if it does not.