If a Monk was to hold two weapons with the light property (specifically in this instance two Sickles), but only attack with the primary hand, would they still be able to use a kick to perform an unarmed attack? The PHB, specifically one of the erratas, notes that:
Instead of using a weapon to make a melee weapon attack, you can use an Unarmed Strike: A punch, kick, headbutt, or similar forceful blow (none of which count as weapons). On a hit, an unarmed strike deals bludgeoning damage equal to 1 + your Strength modifier. You are proficient in Unarmed Strikes.
To me, this seems like a cut and dry case; unarmed strikes are NOT weapons, and instead of attacking with an offhand, a Monk could use their Martial Arts to perform an Unarmed Strike instead with a kick, headbutt, knee, etc., as referenced here in the PHB:
When you use the Attack action with an unarmed strike or a monk weapon on your turn, you can make one unarmed strike as a bonus action. For example, if you take the Attack action and attack with a quarterstaff, you can also make an unarmed strike as a bonus action, assuming you haven't already taken a bonus action this turn.
Likewise, when the character reached level 2 and was able to use Flurry, would they be able to opt to use Flurry INSTEAD of the offhand?