Heavily restricted? Seriously? There is a difference between can not and did not. Natsu could use his stronger attacks but he didn't. That just shows that he underestimates the power level of a Spriggan. Natsu wasn't restricted at all.
Inside a building or outside a building, it just doesn't matter. Jacob will oneshot Natsu with Transport or assassinate him due to Stealth once they're in a solo fight.
Natsu could use his full power, but Jacob couldn't.
Natsu would have used his spells
had he not been in the guild, therefore, the fight being in the guild heavily restricted him. Natsu underestimated no one, he knows how strong the Spriggan are, he simply did not want to wreck the guild with his wacked priorities.
Actually it does, Natsu can escape it. Its AoE is not that large and it takes time to activate. A prompt dodge or hitting Jacob before/during activation are valid counters. We do not even know if he actually can suck in someone of Natsus caliber, Brandish had magic cuffs on.
Just like the Spriggan Twelve, the Ten Wizard Saints are hyped to be the strongest of their continent. Just because Jura was high max diffed by Laxus doesn't mean it's easy to surpass the Gods of Ishgar.
Indeed its not, but when the top tier MC comes around and clearly shows far better feats then all the Saints and even Serena himself, you can't just peg him down due to saints outdated hype.
Bluenote is nothing compared to Jura.
This is simply not true. His feats rival Juras and even using powerscaling, Bluenote was able to give Gildarts a solid fight before going down, which is exactly what Makarov deemed Jura capable of. GMG Jura and Bluenote are damn near equals in every sense of the word, current Jura might be a little better, but not a lot better.
No Ishgar mage is stronger than God Serena lol. This is pretty much stated.
It has never been stated, unless you mean prior to the time skip, in which case sure. He's stronger then the far weaker versions of those characters. Or unless you mean by Ajeel, who thought he could solo
all of Ishgar by himself. Not the most reliable source.