What is unique or rare about the VM Zodiac signs?

[-JKP-]

Blue Leo

• less than 2% of zodiacs
  
• found primarily in English manuscripts from about 830 (England) to about mid-13th century, but there are a couple from Normandy/Flanders and France within the same time period
  
• Cotton MS Galba A XVIII is on bumpy terrain but in a different pose, facing right, head turned
  
• the raised-foreleg pose is found in BL Add MS 21926, c. 1200s
  
• the tail between the legs standing straight up is in Walters W.37 c. 1305 (a blue lion raised-foreleg pose is also found on Seljuk tiles and other artifacts of the 13th century, but the tail curls under or is above the body without going through the legs, so the VMS pose is more similar to the drawing in Walters W.37 (possibly Normandy/Flanders region or England) than it is to the Seljuk tiles
  

Note that all these blue lions have manes.