Yes - Rewriting WFTDA Rule 4.1.1 which presently reads: "The pack is defined by the largest group of in bounds Blockers, skating in proximity, containing members from both teams" is the best place to address the issue of no-start jams.
No - Rewriting WFTDA Rule 4.1.1 is NOT the way to proceed in improving the current no-start jam issue, and I'll tell you why, and what is the best way in the comments. (Given that the issue of whether to address this in a rules change or not is taken up i