KB and boxing he had mentioned cos competions.There seems to be a lot of misinformation out there about Briedis. As a teen he started out as an amateur boxer, switched to kickboxing, and then back to boxing after turning pro in 2009. He used to be a police officer.
“I started boxing when I was 14 years old. Then I switched to kickboxing for some time with pretty good success, winning European Championships and finishing on the podium in the World Championships.
“It was very natural for me to later come back to the thing I liked more – boxing.”
Source
AFAIK he had more am fights in KB than in boxing and didn't had big scale achievements in am boxing ( continental or world level medals ).
KBer version btw IMHO was more watchable than boxer version.
Briedis had competed also under kick light and low kick rules too.
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Am boxing wasn't so effective for him. He didn't had managed to get compete in Games.
However he had stopped in distance continental level medalist he previously had L on cards . ...