The role of fore-aft cyclic tilt of an autogyro rotor is, I think, widely misunderstood. For example, many gyro pilots believe that tilting the rotor aft (with back stick) only increases drag in the short term, and later increases lift, via increased RRPM, in the longer term. But there's another, immediate effect.
When the rotor's axis tilts more aft while the gyro is travelling forward, each blade immediately begins to receive its airflow more from underneath. This is easy to picture for the advancing blade, but it also true for the retreating blade, and for all blade positions in between. "Air striking the blade more from underneath" is a way of saying that the blades' angles of attack have increased (angle of attack, NOT mechanical incidence, which is fixed). This increase in blade AOA is accomplished without collective pitch, but it is aerodynamically identical to pulling collective; the blades don't know the difference. The result is an immediate increase in each blade's lift and drag.
This means that a cyclic-only flare can slow the aircraft's descent in the very short term, even before the rotor has a chance to speed up. The effect is strongest with high forward airspeed, and is zero during a vertical descent.
Helos can accomplish a micro-hover, in addition to the cyclic flare, at the bottom of an autorotation by pulling collective while RRPM is still high. Gyros without collective can do a little of this if their blades are massive enough or the pilot aggressively overspeeds the rotor, but it's generally less impressive than the momentary collective hover at the bottom of an auto in a helo.