According the CCC, there are four levels of sexual assault:
I think that you are misinterpreting what Brihard was saying and perhaps also reading too much into the Stats Canada item.
Brihard is quite correct when he says that sexual assault includes everything from non consensual groping of a sexual nature to full penetration intercourse. He was subtly pointing out that Lightguns was wrong when he broke sexual assault into two categories - minor (groping etc) and major (full penetration). The offence described in s 271 in fact covers both situations and more.
What ss 272 and 273 do is create more serious offences where the sexual assault itself is committed under aggravating circumstances (i.e. a weapon is involved, maiming is involved etc). This is why each of these sections contains the phrase "in committing a sexual assault."
The Stats Canada item reflects administrative categorization levels for statistically purposes. The grab bag of "other sexual offences" in the Stats Canada item do not constitute a "fourth level of sexual assault" but is in fact a disparate variety of other categories or types of sexual offences.
I know its a fine point and I fault the Stats Canada item which is somewhat loose in its language. "Level" is a poor word to use and it doesn't appear in the legislation. I'm also not very fond of the phrase "Level 1 involves minor physical injuries or no injuries to the victim." I defie anyone to use this phrase to the victim of sexual assault. More importantly its a wrong statement. For example, a person may be raped at gunpoint and yet have suffered "no injuries" - its clearly a s 272 offence yet it also meets the Stats Canada Level 1 definition. What really creates a s 271 offence is the absence of any of the circumstances that are required to substantiate a charge of sexual assault under s 272 or s 273.
On the subject matter of this thread in general I just have one comment: writers (and their editors) write whatever they want to write. There's an axe to grind here and there is no news value in a story with the headline "Sexual Assaults rates in the CF are the same as in Canadian society as a whole." I expect neither realistic nor intelligible statistics nor fair reporting to come out of this. Is there more we should do to reduce incidents of sexual assault in the CF? You betcha. Do we, as a group, deserve to be pilloried or hung out to dry? No freakin' way. But we will be.