from what I understand, regarding the CF expres test and qaulifications, those individuals under 35 who do not meet the qaulification level but meet the threshold will go to RFT, ( warrior training, fat camp, regimiental fitness training) which apparently is extensive physical training and nutrition education. Individuals who are over 35 and do not meet the qaulifications at first go straight to RFT.
I have also been told that we will be tested within 24 hours upon arrival at BMQ and that there are a minimum number of push ups required to be able to continue ( something like 10 for males, 4 for females) . Although these numbers may seem small, I believe they are to ensure a certain level of physical fitness to allow the individual to safely proceed with basic training. There are individuals who are more knowledgable on this site who can confirm this information. I have also been told ( or read) that all members must pass the BMQ in order to pass basic training and stay " in", which will be obvious to some, and some will be oblivious. There is also "warrior training" that is a part of Basic Training now that all individuals must complete as part of BMQ, saw a video and while it did look challenging, it did appear fun.
We will also be tested several times during BMQ on our fitness levels, which is probably more of way of keeping track of our progress than anything.
All in all, I have been told many times that they ( "they" being the instructors) are not there to make us fail, or push us hard enough to "break" us. They , the instructors, are there to help us pass the tests, and get through the course, prepare us for life in the military. It is not unreasonable to expect individuals applying to the armed forces to be in shape, to be able to meet the minimum fitness criteria and be able to proceed in what is considered to be a physically demanding exercise in a manner that is safe for the individual.
Regarding your question about the different scenarios of failing different aspects of the expres test, if you fail the run, you fail and go to RFT, if you fail 2 out of 3 of the strentgh aspects ( pushup, situp, grip strength) you fail and go to RFT. Someone more familiar with the current rules could confirm this.
Hope this helped shed some light, and if someone is more knowledgeable on this topic could they please offer there input.