It would be an easy 90 minute win for Arsenal. Porto might have a lead over goal but they are no match to what Arsenal is now. The next game is going to be in a much different context as well. Arsenal has placed themselves as the contender for title of the premier league and the match is being hosted in Etihad stadium, the home ground of Arsenal.
An "easy 90 minutes" you say. Lol. This is funny considering the fact that Arsenal were firing just like this before they went to Portugal and couldn't get a shot on target. The champions League is a different ball game. It is with this kind of overconfidence that Arsenal lost the first leg.
I agree that Arsenal will press a lot but we all know how football is, a goal from Porto will make things more difficult from Arsenal.
One thing with premier League fans is that they underrate other leagues too much. I remember when Manchester United was about to play Villarreal in the Europa final some years back, all United fans and former players said it was a walk over. Maybe if they had taken time and watched other leagues they would have known better. Porto are not pushovers. They won't go to the Emirates to make things "easy" for Arsenal.
I know Arsenal are favourites but saying they'll win easily might not be true.