I also have seen mixed explanations for KO versus TKO. Some seem to indicate that a TKO is only referee stoppage, which excludes an opponent that is knocked completely out. Ortiz-Shamrock 2 was a TKO. Koscheck-Goulet was a tap out due to strikes. Leben's last two fights were KO's (Leben KO'd by Silva, and then Leben KO'd Santiago). But, I have heard the announcers call a KO a TKO before.
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