The accession document doesn't mean $hit, the Indian army invaded Hyderabad under the pretence of a majority Hindu population shouldn't go to Pakistan, so it's null.
Kashmir is unfinished partition business, the state should have gone to Pakistan.
Pakistan should have invaded the moment that filth Hari Singh put forward his standstill agreement.
Which they did with the rather disasterous consequences of accepting a Ceasefire Line North of Poonch and International Border South of it, thereby accepting J&K as part of India vide Karachi Agreement of 1948.
Again, something emulated by Pakistani Army in Baluchistan
Hindu raja facilitated Hindu Army to occupy a Muslim land.
Au contraire, the reverse argument, that of the land being Hindu, can also be made