Dear translators,

I did not understand it is a big stretch and found the following explanation that may be helpful to you as well .

Blessings,
Anneke

Par.11
Truth comes before belief. Truth certainly comes before judgment. Judgment is a kind of opinion. If an opinion judges only one way in the world as correct, well, that is a leap, for in the world, many ways may be right. It is a big stretch to call only one side right. And that brings up another point. A side, a point of view, is a faction, and factions exist only in the illusion of the world. There is one si¬de, and that is Truth. There is one side, and that is Unity. There is one side, and that is Love. Love precedes judgment. I would leave no one out of My love.

A big stretch:

If something is a stretch, usually means that it is not very believable or that something doesn't fit.
He kept saying he's only had one drink, but the way he was behaving made it quite a stretch.
He has been compared to Pele in football, but I'd say that's a bit of a stretch.

Likewise, 'not too big a stretch' means that the story is believable or that an analogy or comparison fits.
"To say that Leed's United is one of the best teams in the world is not too big a stretch."
You could also say 'arguably".
"Leed's United is arguably one of the best teams in the world."

It means we might not be able to prove it definitely, but it is still believable