As I've said already, we are discussing ways to integrate SODE jetways with GSX, because right now the SODE interface is a bit cumbersome to use (you must call a separate menu to tell SODE which jetways to use) and it would be way easier if it was integrated with GSX. Also, there wouldn't be any need to edit airplanes, since GSX already comes with a database of supported airplanes AND an easy to use graphical editor.
Yes, of course Couatl is way more advanced than SODE, since it's based on a full blown programming language, not a set of rigid XML files, and it has been in development for years, and has been tested in very large products like GSX and XPOI, and all our sceneries use it extensively.
However, we still haven't done anything in relationship with IK jetways so, as a temporary solution while we'll finally come up with a proper jetway replacement system (something for GSX 2, I'd guess), we could make user's life easier by integrating GSX and SODE somehow.
I think some of the issues with SODE that has been reported by Flightbeam's Mir (such as overflowing of Simconnect commands ), could be probably fixed by integrating the two.