What the weight is doing
The lowest trend weight by design — the tail wags nothing.
Trend No-Partial carries 11.25% of the default blend against Normal's 45% and Trend Partial's 33.75%. Read as a confidence ranking, that looks like the system half-believing in its own most distinctive branch. Read correctly, it is a variance budget. The branch's contribution to blended expectancy is capped at a level where its swings cannot dominate the account's drawdown path, which is precisely what allows the branch to be run with an intact right tail rather than being defensively managed into something safer and less useful.
The four branch weights in the default profile. Trend No-Partial's small share is what buys it permission to run unclipped; Normal's large share is what keeps the blend's behavior estimable.

