Comparing the access of the active site of 3QXE and 3HHT

If you orient the pdb file of the Geobacillus which is coded as 3HHT as I have done for 3QXE and 2QDY in the previous posts, you get the following two images.

The cobalt is no longer visible. However if you twirl the structure around you can find a view of it through a different aperture. I wonder how this impacts on the selectivity of this enzyme.