Is grammaticalization the only process generating grammar?
Is grammaticalization the same as the development or evolution of grammar?

Constructions are first formed freely in discourse and then transferred into the syntax by conventionalization.

Apart from the morphologization of phonological alternations, grammaticalization is the only process creating grammar.

Since no basis is known on which grammatical formatives could be created directly, the only solution is that they came about by grammaticalization.

Every single grammatical formative in every language of the world must have a lexical source.