KuKulZa, a tegha blade is often as wide as the guard, almost reaching the finials of the quillons.
There is no rule for this, it's more to do with the general proportions of the thing, blade width to hilt proportions. Rule of thumb I use - tulwar blades are narrower than the disk pommel, while tegha blades are wider than the disk.
Compare below, tegha from OA.
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