Hopefully this helps us. Becoming an international regular and aiming to play at the next Word cup is presumably a big part in his decision making. Right now he’s firmly on the cusp of it and would know that unless his form drops massively, he’d be signing the Hibs contract to be a first team player and fan favourite, with exposure in Europe.
Moving club is more of a gamble and he won’t get into the DR Congo starting team if he doesn’t settle and sits on a clubs bench.