SE must be drunk.

[Reynhart]

Having a 2nd weapon doesn't add a multipler, it adds a extra hit if you're doing a multi hit weapon skill, useless in Viper bite.

https://www.bg-wiki.com/bg/TP_Multiplier - no i actually have sources to back my claims. So far you've provided nothing but horrible stories of leveling at 30.

In case you're too lazy to click on the link above, "TP Multiplier (fTP) is a multiplier of your Base Damage when performing weapon skills or physical blue magic. ".

FTP :Additional hits on the WS (be it from double attack, triple attack, Quadruple Attack, dual wield, or subsequent hits from a multi-hit WS) will always have a fTP of 1.0.
And in case you're too lazy to properly read a WS description : Viper bite strikes with twice the attack power. so it have its own multplier unrelated to TP.
The simple fact that you think this WS is worthless proves that you don't know anything about playing THF.

Also, I really like your video of Byakko tanked by a BLM...Who does literally no attack spells, crippling its own DPS to the floor, and needing constant transfered enmity (With SA+TA) to even keep the mob on him, and a horde of healers for the few seconds where its shadows fall. He should have let the real tank tank and do its job as a DPS.

Keep digging, you'll find gold...