See https://en.wikipedia.org/wiki/Wright_brothers_patent_war
See https://en.wikipedia.org/wiki/Wright_brothers_patent_war
I took this to mean that they were inquiring whether the government would be interested in a system manufactured according to specifications agreed to by both parties (or just providing the IP according to a license agreement), not necessarily for a pre-existing system. Necessary modifications to a system do not make for a fully developed machine.
If you're implying that the Wright brothers are not looking for R&D funding like Langley, I agree. They made that explicit in a later letter to the government. It's too bad that the government gave funding to Langley yet somehow rejected contracts to complete a working system with the Wright brothers, despite their initial successes.