Yes, Saito Sensei was my first thought too. I have noticed changes in how Saito moved as he got older (his kamae was originally much more like the "standard" Aikikai one).
The really strange thing for me is the way so many people in the "Iwama Ryu" tradition, having swallowed the line that "this is EXACTLY how O-Sensei practised", copy Saito's posture even though their bodies are healthy...
Yeah, I've met a few Iwama diehards who insist that their posture is the only way to do these things. I've shown one of them some photos that demonstrate that Saito had a very different kamae, very Aikikai, in the 1960s and 1970s, but they still refuse to concede the point.
I think the other shihan that Homma refers to as having injured his knees and therefore relies almost entirely on hand movement is Tamura.