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> Probably the best reason is the existing change can do all the things you mentioned:
> "Grizzly will be able to send and reply and get replies from Havana, regardless of if Grizzly is set to compatibility mode or not"
> This can be accomplished by retaining in Havana the code that recognizes the old message content and replies in the old way if found.
> 
> "Grizzly would also, by default, be able to send and reply to Folsom, as well as receive replies from Folsom as long as compatibility mode is not disabled."
> 


Yes, it can do both, but not at the same time. Without listening on two queues, the code does one-or-the-other, but not both. The code is either forwards OR backwards compatible. It would be much easier for migrations if it can be both.

Regards,
Eric Windisch