I Never Noticed

Here's a short FGO I presented a few months ago:

"I just noticed in Palm Sunday's Gospel reading from Luke, that at the Last Supper Jesus didn't eat or drink after the words of Consecration:

"And when the hour came, he sat at table, and the apostles with him. 15* And he said to them, "I have earnestly desired to eat this passover with you before I suffer; 16* for I tell you I shall not eat it * until it is fulfilled in the kingdom of God." 17* And he took a cup, and when he had given thanks he said, "Take this, and divide it among yourselves; 18* for I tell you that from now on I shall not drink of the fruit of the vine until the kingdom of God comes." 19* And he took bread, and when he had given thanks he broke it and gave it to them, saying, "This is my body which is given for you. Do this in remembrance of me." 20 And likewise the cup after supper, saying, "This cup which is poured out for you is the new covenant in my blood."

Nor in Matthew: 
 
  "When it was evening, he sat at table with the twelve disciples... Now as they were eating, Jesus took bread, and blessed, and broke it, and gave it to the disciples and said, "Take, eat; this is my body." 27 And he took a cup, and when he had given thanks he gave it to them, saying, "Drink of it, all of you; 28* for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. 29 I tell you I shall not drink again of this fruit of the vine until that day when I drink it new with you in my Father's kingdom."
 
Nor in Mark:
 
"And as they were eating, he took bread, and blessed, and broke it, and gave it to them, and said, "Take; this is my body." 23* And he took a cup, and when he had given thanks he gave it to them, and they all drank of it. 24* And he said to them, "This is my blood of the covenant, * which is poured out for many. 25 Truly, I say to you, I shall not drink again of the fruit of the vine until that day when I drink it new in the 
kingdom of God."  
 
Having thought about this for several minutes (!), I believe this points to Transubstantiation. If Jesus were speaking symbolically when he said "This is my body...this is my blood," then why not share in the eating and drinking along with the Apostles? If nothing else, it would clarify that this bread and wine were no different from any they had consumed earlier in the evening; lest anyone erroneously suppose Jesus was speaking literally on this night, and also the day after the Loaves and Fishes miracle (John 6). 
 
On the other hand, if Jesus had indeed transformed the elements into his own flesh and blood, then it would be appropriate that he not partake in consuming himself.