Big Fish and You - Patch 2.4 (speculation (or is it? :))

[eremonxi]

With all the other caught, it can't be long until it will be found. While the Helicoprion is down, I'm working on the Shonisaurus in Witchdrop, would appreciate some help theorizing:

What I tried: Caught everything, including up to 3(5) Rhamphorynchus (if repairing without zoning won't interrupt it) in a row and 1 Mahar. (But no buff yet)
My ideas:

-> If its a buff it involves more than 5 Rhamphors or more than 1 Mahar.
-> If its not a buff, it would have to be a rare weather condition + mooch or straight catch.
-> Given the description about the lighter-than-air gas, matching the description on Balloon Bugs, i like to believe it would make sense for the Shonisaurus to feed on the Balloon Bugs, rather than Hoverworm, OR the other possible option, Saucerfish.

So what I want to have a go at next is checking rare conditions and make suffiencient attempts to catch with streight balloon bugs. - knowing that its still possibly a mooch off CloudCutter or Saucerfish.

If it was in Analogy to the Helicopryon:
Rarest condition->Zonespecific Condition->shared mooch with other big fish in area
then i would expect it to be:
Clear weather(4.7%) -> Blizzard (19.4%) -> Saucerfish Mooch

Baloon Bug description makes me wonder tho

What do you think is most likely the case here?