If we do all the quests that are the pre-requisites then i believe so yes. as of now we’ve not crafted any.
Unfortunately i’ve heard nothing of the sort at the moment, we don’t have any information about the Marvel grand cross as of this point of time.
Here’s my answers to your questions.
Question 1:
The GuildMaster need to use Templar Char to Open events OR can be any Char in his account? In other words: if you have other character better suited to battle, can you use it instead the Templar char?
You can use any character to start the event, it does not necessarily have to use your templar character. I normally use my cleric or archer to join events.
i’ll skip question 2 since it’s related to each other.
Question 3:
Do you really think Templar Circle 2 is needed in order to make the guild much better? I know that now that Stats as STR will be really usefull in the new path, that the increased count of STR added by the skill “Battle Orders” will be great, but I dont see much relevance on the other skills of Circle 2. And I already saw a lot of people taking Murmillo, Shinobi or even Squire C3 instead Templar C2 for a more general benefit.
The forge on Circle 2 of 110 Attack dont appear much worth it on the end game, where the damage is generaly >2000 each hit. But I dont know.
And Shield Charge appear to benefit only a few members.
Well generally, Templar 2 is needed for guilds that want to have additional utilities, it’s actually more of enhancing your guild to have additional buffs to be useful in GvGs, this also allows you to use forges and shield charges, while i can’t say for sure about shield charges as i heard there were several bugs in between, but remember that you can place up to 5 forges in templar c2, thus instead of having 110 attack, it’s going 550 and this is going to be massive with the latest damage patch coming in.
In fact, it’s actually quite a bit especially if you’re rerolling a new class and having 550 physical attack greatly enhances your damage by quite a bit.
Following what IMC has said, templar C2 is mainly for guilds that want to focus a little bit more on GvG, else if they’re purely for PvE, templar c2 isn’t required. but then again, if you’re only templar c1, you won’t have access to forge which is a common reward in late game guild events.
Question 4:
You said yourself:
My personal opinion is that templar isn’t a DPS class as you will not be able to scale as well as the other classes upon reaching the highest rank, therefore you may opt to go for a support build or tanky build (mixing rodelero, squire, peltasta inside).
So, how do you manage to Level Up your Templar until C2? Do you force your members to level up you in party while you do some poses
?
Well, i still believe that templar isn’t really a great DPS class due to the fact that most templar skills lie on the utility side rather than support.
I’ve played my templar as my first character, therefore during the phase of early access, there were extremely alot of parties that were looking for peltasta compared to the current time where all classes are accepted. I remember back then when swordman without peltasta are excluded from parties.
I grinded my way up to level 280 and maxed this character up before experiencing other classes, honestly when i played my archer as my 2nd character, compared to spending 15-20 minutes for a quest boss, my archer did it in seconds for some bosses lol and i’m honestly happy i didn’t start with an archer first else i might not have the patience to make a templar 
I solo-ed for quite a bit though, i don’t force people to help out in my grinding. Most of us in the guild already have a habit of helping each other out, so i wouldn’t really consider that forcing. Whether it’s the centaur quest or mishekan forest upon hitting 317, we’ve helped each other countless times.
We also have a channel in discord where we post up grind parties, quests, ET and to bring everyone up together. This helps up alot for grinding 
especially for newbies that joined the guild.
