It's not about Kessler, Sexton, Collins or Hardy: it's all about Lauri. When Lauri plays like he did in his All Star year (and like he did yesterday) we will win some games against good teams and quite a few against bad teams. Kessler, Sexton, Hardy etc. are just his supporting cast.
The Jazz were losing because Lauri played well below his usual level in his first games. If he keeps playing like yesterday the Jazz will climb out of the bottom-5 rather quickly. When Lauri scores 30 points or more the Jazz are 17-9 - and this is including the games when the Jazz tanked hard at the end of 22-23 and 23-24, leaving Lauri with very little help.