Be careful - I think you're mixing up concepts here.
When we talk about leading with the hips, we're talking about the relationship between hips versus head and shoulders. Some pitchers get their head and shoulders out front and that is no good. The head and shoulders need to stay behind the front hip into foot strike.
When we talk about leading with the heel, we're really talking about the rotational position of the leg and foot during stride. Leading with the heel means the leg and foot stay closed until right before foot strike. This is in contrast to leading with the toes which tends to open up the hips depending on your flexibility.
If you're talking about a rotational issue with the front leg - that is, keeping the front leg/foot closed while you stride, then I would agree this would help keep the hips closed longer. But this does not eliminate the need to have the hips lead the head and shoulders.