  We prove a conjecture of Casselman and Shahidi stating that the unique
irreducible generic subquotient of a standard module is necessarily a
subrepresentation for a large class of connected quasi-split reductive groups,
in particular for those which have a root system of classical type (or product
of such groups). To do so, we prove and use the existence of strategic
embeddings for irreducible generic discrete series representations, extending
some results of Moeglin.
