he probably means best as in how it can be a high ATK monster, which really is all he is and also use to get over high ATK monsters plus can attack twice leaving the opponent clear for other monsters or giving more of a chance to deal damage with him. It ain't good but it ain't terrible but highly doubt people will switch to it
Just tried, can not defuse due to unspecified fusion material monster. It just sends noes knight to the extra deck and no cards are summoned from the graveyard