SoY-2: Online Tournaments "Seasons of year" - "Seasons of year" - Autumn Season 2007

Amidst the general commotion, I'd also like to ask my question:
For example, the hero Solmir is banned, but can another hero learn his Chain Lightning spell and use it through the "Literacy" skill?
And I'd also like to clarify: can banned heroes be used until their level increases by TWO levels, or up to level 2, after which such a hero must be dismissed?

Let me explain the situation in more detail...
Mori@rt (Tower, Aine) vs. Alex_R
Map #3, One&One.
I'll immediately say that I didn't participate in the previous "Seasons" tournament, nor did many other participants in this (autumn) tournament.
Before signing up, I read the rules and didn't find anything about the Grail. After signing up, I kept track of changes to the rules so as not to miss anything (for example, army merging). The Grail wasn't banned during the tournament. Now about the game...
There are 8 obelisks on the map, 6 of which are in neutral territory.
I learned the name of the map a few minutes before the game. I looked it over and saw that I could view all the obelisks (except for one) without going into the opponent's territory. I came up with a plan for the game:
1. Use the Gremlins to quickly break through the Dungeon's defenses.
2. Send 2-3 more heroes there.
3. Collect the obelisks.
4. Dig up the Grail.
Based on this, I didn't develop the Castle as I would if there were no Grail.
And on day 1.3.7, it happened - I dug it up. I immediately sent it to the Castle to start building.
The main hero and one assistant (who were digging) remained standing, losing their turn. Then Alex attacked me.
No problem, I thought, the Grail is with another hero. And Aine will just run away, and it will be easier later. But suddenly, Alex tells me that I'm not allowed to dig up the Grail. :( Even though it's not prohibited by the rules.
And what is not prohibited is allowed, especially if there are obelisks on the map.