If you ignore the words between the commas, Article V does reasonably reduce to "The Congress, ... , ... , ... , shall call ... ," imo.
However, Article V's "Congress shall call " doesn't give Congress a choice any more than the 1st Amendment's, "Congress shall make no law ...," does imo.
Right, but in the second alternative, the amendment process is initiated, run, and ratified by the states. After the "Application of the Legislatures of two-thirds of the several States," Congress' role to "call a Convention" is merely clerical or administrative.