As you see it doesn't say "may be directed by congress", a proposal is a suggestion. If 3/4ths of the States agree to the language of an amendment, they can ratify it without involving congress at all and it will become part of the Constitution.
Sorry, that has already been settled. The case was United States v. Sprague where someone challenged an amendment. The court held that Congress has the sole responsibility for determining the method of ratification of an amendment.
FindLaw's United States Supreme Court case and opinions.
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Once again, a federal court granting the federal government more power, who would have thunk? And people wonder why we want to water down the power of the federal courts and put checks and balances on them.