DY -“I should point out that my diyuk is not merely from the ?, the entire context would indicate that there’s no other hot food; the reason they would move the food is because, not having gas or electric as we do, the oven often had cooled by the time the Shabbos meal would start.”
The oven did not cool -it’s Klor from the MB -95 -“even if he doesn’t put it on top of the flame”. The reason the food cooled because he took it off for the Fri. nite or day meal and now wants to finish it and wants to eat it warm.
“They didn’t have an oven, a hot plate, and a crockpot; at most they probably had a cooking oven and a heating oven.”
Whatever they had, they didn’t have more than one and the flame was still on.
“The Biur Halacha doesn’t stop at the words “tzorech Shabbos”, he also says “v’ain lo eitzah acheres”.”
You put in words that it doesn’t say, neither in the Rema or the B’H and then you say “They hold Ameira L’acum is Ossur B’mokom Tzorech Godol”. There is no Raya either way from over here. This to me is unbelievable. “Tzorech Shabbos” -means just that. It doesn’t mean Tzorech Godol! If you want to eat hot food from the leftovers -this would be Tzorech Shabbos, but not necessarily Tzorech Godol. “V’ain lo eitzah acheres” -this means – he has no other means. Means to do what? To warm up the food. It doesn’t say this is his main dish for the meal. For all you know he ate his meal already. You just can’t make up a Pshat that it doesn’t say, esp. trying to bring a proof regarding something else.
This isn’t a case of Tzorech Godol. Lo Hoyeh V’lo Nivra!