Wild > Aeolian > Shark Bite/Exentrator should be fusion>light
Wild > Aeolian > Exentrator(Aeneas) x2 should be fusion>light>Radiance
I don't think that's correct. Wild Flourish into Aeolian Edge makes Scission, not Fusion.
It looks like Wild Flourish applies the skillchain properties Liquefaction, Induration, and Reverberation in order, then after that, Impaction and Compression though the order of those two is indeterminate. Probably applies the other three as well but other properties take priority so they won't matter.
In-game, the weaponskill menu for Aeolian Edge lists Scission, Detonation, Impaction in order, presumably as their priority in terms of primary, secondary, and tertiary skillchain properties. I think the BG-Wiki article erroneously lists their order as Impaction, Scission, Detonation, so I see where you were coming from if that was your reference.
For reference, if you start with Wild Flourish:
Wasp Sting, Viper Bite, Dancing Edge, Aeolian Edge, Pyrrhic Kleos, and Exenterator all lead into Scission (starting from WF's Liquefaction, and Scission being the highest priority level 1 skillchain property present on those)
Shadowstitch leads into Fragmentation (falling down WF's priority into Induration, which Shadowstitch's Reverberation combines with to make Fragmentation)
Gust Slash and Cyclone lead into Detonation (falling aaaall the way down into working off of Compression)
Evisceration leads into Transfixion (Compression -> Transfixion)
It's possible to form Fusion from Wild Flourish, just not with the properties available to Dancer's dagger weaponskills. If they go hand-to-hand with Kaja Fists or Karambit, for example, they can do so with Combo and Spinning Attack, or with Flat Blade if they wield a sword. However, their skillchain properties (among other things) are highly limited with those weapons. To do what you said they would be capable of doing above, they'd need a dagger weaponskill with just Impaction at a higher priority than Scission in order for it to actually close Fusion instead of Scission.
Literally the only way for a Dancer to self-skillchain Light is by mainhanding Aeneas and doing Exenterator > Exenterator.
(Or unless you do something goofy like juggling weapons mid-combat, but you risk dropping the skillchain due to resetting your TP.)