I don't know if these loft progressions make any more/less sense that the Sterlings. In fact, I don't get why Tom went to a 23* 5-iron and then put a hi-COR face on it. That doesn't seem to make sense to me because I would think you would hit it too far. However, I haven't hit the Sterlings, so I can't really say for sure.
I know that I didn't have any difficulties with the gaps in my 1Irons when I played them, so I don't put much stock in this need for hi-COR long irons. That being said, the 1Irons are built to 7-iron lengths, so that may make some difference. However, I also didn't find their 3- and 4-irons any easier to hit than "regular" 3- and 4-irons. I suspect that's what happens when you get lofts of 19 and 23 on any iron, regardless of how long/short you build it.
Also, I don't think that the Inazone take a different approach than the 1Irons. If you look at the two set's progressions, they are almost identical accept for the numbers on the bottom of the clubs. The Inazone 5-iron is only a degree off the 1Iron 4-iron, and the same is true of all the irons up through the set. Inazone has simply brought disappearing lofts to the SL game. 🙂