What it seems your talking about is using the first 9 ft. of coax as a counterpoise. This could work theoretically, but you must break the coax with a choke balun for it to work like this as I said so already, you didn't say anything about using a choke you just said that it is common knowledge that the 1st 9 ft of coax makes up the 1/4 wave which is wrong. It is not a designed feature of the antenna to automatically use the first 9 ft. of coax as a counterpoise. This sounds like CB shop urban myths.
I wouldn't recommend this especially since the ground plane kit is cheap enough and has 3 radials which would be far more effective. Vertical antennas are only one half of a complete antenna sort of speak, therefore you should use a ground plane kit or ground radials which need to be 1/4 wavelength of the frequency band the antenna can resonate on. Multi-band antennas need at least two 1/4 wavelength radials for every band the operator can work on. The ground radials make up the other missing half of the antenna.
Most antennas including Amateur antennas don't come with a supplied 1:1 choke balun. Certain Amateur antennas usually come with transformer or other types of baluns specific to that antenna.
What we are talking about here is keeping common mode currents minimized, not antenna matching or counterpoises.
When controlling common mode currents, the choke balun should be at or near the source of the common mode current to start with, the antenna and at the feed point. That's a fact.
Common mode currents can manipulate SWR meters in the shack so it's always best to use an antenna analyzer if possible or an SWR meter at the antenna feed point with a short jumper to check the antenna. If there is a difference between checking the SWR with a balun on or off, then I would question the balun since I have had bad luck with the MFJ 915.
I have had good luck with the ones made by Better Balun Designs.
TVI can be reduced if common currents are minimized, but other things can cause TVI as well.
