"The time gap between the taking of one species and another has nothing to do with it."
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The way in which the bread and wine were treated was indicative of how they were viewed. They did not put any unused portion of the bread in a special box till the next time they had communion and likewise with the wine. They recognized the bread and wine were symbolic.
All you know is that St. Paul writes of the reception of the Precious Blood following the reception of the Body at the Last Supper when Christ himself gave the Eucharist. You cannot even point ot any particular time gap. The rest is your plain conjecture not based in any scripture. The Orthodox don't reserve the elements today, and they beleive in the Real Presence. The priest simply consumes the unused parts.
Please indicate ONE statement from the early Church that clearly and unambiguously denies the Real Presence and holds that the bread and wine were only the symbolic presence of our Lord.