I doubt restaurants would have that much by-product. The cooked marinade and the excess amount of sauce in the Madras would become a huge drain on profit unless all of the sauce is served. If this is the case, the dish again shows the difference in UK gravy : meat ratio compared to my expectation and how I cook curry.
A large amount of carrot in the base gravy is new and he removed the whole spices, tree bark and leaves, before blending.
Interesting to see the 2 different substances both referred to as tomato puree. Out here we have paste, puree, passata, diced and whole.