Played TK a month ago. The guy I played thought that because his 10pt unit champion had BS4, his block of 40 archers could use the champion's BS4 to shoot instead of their natural BS3. The funny part is that he's been using Calida for 6months or so and only recently did someone point out to him that she conveys her BS to the unit. (we would've mentioned it but he's the only TK player, so no one knew). Maybe that's why he thought the champion increased the units BS. Now that I write this out, this is more of a sad story than it is funny.
Just wish I could have seen the look on my face when he told me his 10pt champion gave his huge block of archers +1BS. Now THAT was probably funny.