About EOBT
You may want to have a look at the Spanish AIP.
Spanish AIP (ENR 1.10-17)
"To acquire the appropriate data coherence and consistency
of traffic demand, which allow an optimum application
of airspace capacity and flow control measures,
even if the AOBT may be advanced in 15 minutes, take
off shall not be permitted before the EOBT. (The Taxi-time
can never be negative)."
Does it make any sense? I don't think so, but it is the law.