F09-MT: Yes
Rationale
The no-next-hop forwarding branch can maintain two live forwarding branches for the same communication. Witness: A reaches CLIENT relays B and C; B and C cannot hear each other, and each reaches D. Both copy the initial packet for forwarding before either hears a duplicate; D can receive through either branch. This is concurrent logical path use over a shared radio medium, not simultaneous physical transmissions, bandwidth aggregation or a source-selected multipath scheduler. Known-next-hop traffic may use only one branch. Architectural inference from forwarding and duplicate-cancellation code.
Assessment method
Read-only code analysis and explicit topology inference
Source context
Pinned Meshtastic firmware: forwarding, authenticated receive and client serialization
Outstanding qualification
Run the hidden-relay diamond with no next-hop hint and adequate hop budget. Capture both forwarders and D; distinguish overlapping logical paths from collision or source retry. Then establish a next-hop hint and compare. No execution yet.