I know you posted that as a joke, and it worked: I laughed hard when I read that quack's article. Thanks for the daily chuckle.
Check out that chiropractor's bio:
http://www.yourmedicaldetective.com/public/department49.cfm
Now, in all seriousness, while some medical schools/osteo schools may admit students with 90 credit hours of college sans degree, this is not the norm and those students would have to walk on water.
ALL (and I mean ALL) medical schools (allo and osteo) in the US and Canada require the MCAT. There is no exception to this. All accredited schools that is. No DC school requires any form of entrance exam.
Here's the thing to remember about education. Among MD and DO programs, there is little significant difference between the programs. An MD is an MD no matter if you went to Harvard or the Medical College of Ohio. A DO is a DO whether you went to Kirksville, NOVA, or Michigan State. The core and substance of the MD program is the same no matter you go; it's mandated by the AMA.
An MD is very similar to the DDS, DVM, DPM, PharmD, and admittantly, to some extent, the OD in form, structure, length of study, etc. Of course an MD and a DDS or DVM are not the same and differ significantly, but all things considered, they share a lot of similarities including admission standards, academic rigor, clinical skills, etc.
It is a common misperception that all medical students must be exceptional students and all medical students must be super intelligent. I've known osteo med students who have 2.5 GPAs in college, 2.5 GPAs in DO school, and still made it through and are now physicians. I've met some incredibly dull MDs and DOs. The degree does not make you better; it's what you do with it and who you are.
Also, there are other health professionals out there who have more education and training than some physicians.
Some examples:
1) An Oral-Maxillofacial Surgeon (OMFS) - This is a dentist (DDS) who went on to do a dental residency of 4-6 years post DDS. OMFS have full hospital privis and perform complex surgery that goes beyond oral surgery. Your average OMFS has more years of residency training than your typical internist and even some general surgeons.
2) A clinical pharmacist friend of mine is another example. She has a BS in biology from U Washington. She went on for a 4 year PharmD at Purdue. After her PharmD, she did a 2 year residency in internal medicine and a 2 year residency in drug information/toxicology and then a post doc fellowship in medical informatics. Compared to most GPs, FPs, peds, psych, and IM physicians, she the same years of formal education and more years of residency/fellowship.
3) Many attorneys, psychologists, and other professionals actually have more formal years of schooling coupled with clerkships, internships, etc. than some general physicians.
MDs and DOs are not necessarily the top of the food chain in health care, even though we like to think we are. HOWEVER, going back to DC education, there is no comparison. To get into chiro school and graduate with your DC degree, you need little intelligence and very little scruples. It's an unscientific based field of study. You cannot compare the DC degree to an MD, DO, DVM, PharmD, PhD, DDS, OD, or DPM. It's substandard to all professional degrees.