Trunks sword looking different could be an artistic choice, and there isnt other explanation as of why he has it other than a headcanon.
Why is an explanation even needed? Again, need I remind you, the sword with the golden hilt Trunks brandishes in exactly
one (
1) shot in the series opening
does not appear in the series itself
once.
Never is Trunks ever depicted wielding a sword of any shape, size, or color; nor is he ever referencing or alluding to a sword he owns; nor is he ever even suggested to be a swordsmanship of
any level of ability. During the events of
GT, Trunks and swords never intersect. In fact, I do not even believe the sword is brought up in the
Chōzenshū.
yes and nice, doesnt really disprove warth of the dragon from being canon to the anime.
Your
entire argument is founded upon the idea that Tapion's sword and the Dragon Fist are carried over from
Wrath of the Dragon. Tapion's sword does not appear in
GT, Trunks never uses a sword during the events of
GT, and
Chōzenshū 3 confirms Goku developed and first used the Dragon Fist against Super 17 in
GT.
If anything, guides can contradict themselves more often than not, and you know primary canon takes precedence over supplementary material.
Nothing in the source material implies Goku did
not develop and first use the Dragon Fist against Super 17. Why is Goku
ad libbing a technique such a far-fetched idea to you? He has improvised new moves before; say, for example, the Feet Kamehameha. In fact, when Goku first uses the Dragon Fist, he does not unleash forth a dragon made from energy which ensnares its target and then explodes, like against Hirudegarn in
Wrath of the Dragon; he simply charges straight through Super 17, as he once did against King Piccolo, with the image of a dragon guiding him as he unleashes his full power.