Then come up with a comparison of US and rebel cavalry
Not really, no, I'm translating "recruited into the CSA when that was possible" into support for the CSA during the early stage and "recruited into the Union over the same time frame" as support for the Union during the same stage.
Note that I allow for people to change their minds over time.
There's also the very, very suspect "infantry regiments" comparison when it's already been mentioned that a large fraction of CSA recruits from Kentucky were cavalry - that's veering close to actively obfuscating facts!
Then come up with a comparison of US and rebel cavalry recruited in Kentucky at the same time, summer of 1861 through the winter of 1861-62.
According to the NPS database, there appears to have been exactly one full regiment of rebel cavalry recruited at this time, the 1st:
http://www.nps.gov/civilwar/search-...tFunctionCode=I&multiselect=I&battleUnitName=
The Link to the CWS&S database was provided earlier, as well.
Worth noting is that the nine rebel infantry regiments recruited in the same period appear to have all been redesignated as mounted infantry later in the war, which presumably accounts for the "more Kentuckians served as cavalry with the rebels" meme.
Then there are various battalions, squadrons, troops, consolidated regiments, new regiments of cavalry, mounted rifles, mounted infantry, etc that are formed, reformed, disbanded, etc over the next four years - as well as multiple units for which no history is available, out to a total of 78 units of various types and establishment dates. You are more than welcome to dig through the database to satisfy your own curiosity.
The obvious inference that can be made is that the rebellion just as not all that popular in Kentucky, whereas Kentuckians came out in large numbers for the US, and in 1861 ... Which is, of course, supported by results of the elections held in 1861-62. Elections, of course, are generally not held in occupied "enemy" territory...
So if the figure of five Kentucky loyalist cavalry regiments is compared to the figure of one rebel cavalry regiment organized as such, and the figure of 28 loyal infantry regiments is compared to the figure of nine rebel infantry regiments, all of the above organized as such in the first year of the rebellion (April, 1861 to April, 1862), one still sees the reality.
Best,