This has actually been really bothering me! I could almost swear that at some point someone references the other nine honor blades still being in Shinovar. I'm going to look it up to confirm when I get a chance. The fact is, though, that Talinel's blade should never have remained at all. And 'Ten Honorblades' is definitely referenced often. Additionally in the epilogue of WoK, Talinel falls unconscious and his blade falls to the ground without disappearing (despite him still being alive). Honestly I took that to mean that it had to be his honorblade, otherwise it would have disappeared.
So in theory, the blade Dalinar took from Talinel has no reason not to be an honorblade. I really don't see Wit taking the honorblade and swapping it for a shardblade.
The only other thing I can think of is that the blade Talinel had didn't disappear because he wasn't bonded to it, and I suppose he could have banished his own. I'm definitely going to need to look up and see if the number of blades remaining in shinovar is referenced.