i think the Hero's shade is actually MM link grown up because the HS sword and the gilded sword are similar also why go on about it eh he says he is of link's bloodline basically which could mean he is the actually spirit within them to keep them fighting how else do you explain the resurrection each time they die. Also before someone says but if he is the spirit then why does he leave link to teach him his moves SIMPLE ANSWER: link is a wolf when he calls the HS which means his spirit is free to leave because they no longer share the same human form. Hope this helps
1) The game is over a century since OoT/MM. If it was OoT/MM!Link, he'd be old and rotting.
2) He never mentions being in the same bloodline as TP!Link. Ever. Not a single time.
3) Resurrection is just part of the game. Without it, the game would be impossible to play for many people. Link doesn't actually "die". He doesn't actually have more than one heart.
4) Calling the Hero's Shade doesn't mean that Link's spirit is free to leave... that's... I mean, it's a neat idea for a fan fic or something, but it's not a part of the game in any way.
Excuse me, but do you know Japanese? I didn't think so.
It COULD be a century, but looking at ll the old photos, the zora heritage (especially since the zora can live 400 years (see OoA)) it seems more like centuries.
Try not to be so aggresive, please. The user might just so happen to know Japanese, you never know unless you ask. Even if he doesn't know Japanese, Zemen is known for seeking knowledge on the series. I'm sure he's looked around at various sources.
------------------------------------------------------
Yes, it's true that both plural and singular form for "century" and "centuries" is the same word in Japanese. This already caused a problem when
The Wind Waker first came out. It was first said that the game was a century after OoT's original (adult) timeline, but was later pointed out that the proper term used in an interview was the plural form.
If TP is parallel, it's more than likely centuries
(plural) after OoT's child timeline.
------------------------------------------------------
Now, onto addressing the actual topic. No, the Hero's Shade doesn't cause any discrepancies with the timeline. The only discrepancies that arise are caused purely by the common fan speculation that the HS is a spirit of or related to OoT/MM!Link. However, canonically, it is
never mentioned in-game that there is any relation between the two.
It is mentioned that there was "
a" hero previously, but
who he is or
how long ago he lived is never brought up in-game. For all we know, it could have been a brave Knight of Hyrule. It could have been a legendary King of Hyrule for all we know. In OoT, it's mentioned that the king unified the country. In TWW, a king makes a noble wish in an effort to save the new land. In ALttP, a king orders the Seven Sages and the Knights of Hyrule to seal the gates to the Golden Land. In AoL, the king actually had magic, and placed a spell on Hyrule that would cause a crest to appear on the hand of the next great king. So, these kings all did heroic deeds, meaning there can be other heroes of other sorts.
So in conclusion,
no, the canon information (what little there is) on the Hero's Shade doesn't cause any timeline problems; it's the fan speculation that does.