Lew,
Your logic does make sense. Wootz is brittle. When it comes to sword blades, it has great strength against cutting-edge directed impact, but not against front or side impact. This katar may very well be an attempt to addres this weakness (perhaps similarly to scarf-welding effect and heat-treated/tempered edge). I cannot think of another examples/references, but you may be on to something. Good thinking!
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