I knew FWR is an incarnation of Syaroan, but him being Watanuki blew my mind.
Watanuki and FWR are in relations of "no" time and they both care for the Dimension Witch.
But, I have to agree that Watanuki may possibly be Clow because they look alike.
Instead of the Watanuki/FWR, I previously kept thinking that the Dimension Witch is Sakura.
The egg is probably the erasure of one's memories, but I, too, believe that the egg is a "dream".
Domeki may not have the egg with Watanuki because Watanuki is a lost cause for achieving his dream because he LONGS for and cares for the Dimension Witch similarly like FWR.
FWR is trying very, VERY hard to make his dream come true(bring back a dead person back), but he is somewhat failing. Thus, Watanuki's dream cannot come true.