Great knot illustrations, though I must confess I've never been a big fan of knotting guylines, especially when using the newer, thin Spectra-based cords. Tying and untying, especially with wet or cold hands and/or frozen lines can be a royal pain.
Likewise, I think the cam-style tensioners that BPL and Hilleberg sell are confusing to use and limited in their application, since they generally require pre-formed cord loops, which makes them (for example) inconvenient for use on trees.
Instead, for many years, I've been using end-style tensioners like the one (made by Exped) shown below.
This tensioner is tied permanently (through the bottom hole) to the free end of the guyline. When it's time to tighten the line, the free end can be looped around most anything (tree, stake, etc.) then slipped back over the line through the tensioner grooves.
As far as I know, the Exped tensioner shown above is the only one of this type currently available that holds well when using thin Spectra guylines such as Ketly Triptease or AirCore PRO Dyneema guyline sold by BPL. And unlike the metal (closed-end) tensioners sold by MSR or the "Figure 9" tensioners sold by Nite Ize, these plastic tensioners are easy on guylines and won't chew them up with extended use.
Sierra Designs used to sell this type of tensioner (for small lines), but apparently doesn't offer them anymore. Likewise, REI sells larger tensioners of a similar design but they work only with fairly thick lines.
BTW, the Exped product is available from Moosejaw and other online retailers for about $4.00 (package of 8 tensioners).