There was a pretty good video on BBC a few years back looking at if bigger pitches lead to late goals, and how what may seem a small size difference actually makes quite a large difference in the space players have.
Reports from Germany also say they are investigating the letters to see if they are fake distractions to pin it on other groups. A leftist group has also claimed responsibility. If it was ISIS surely they would already have claimed responsibility.
I don't usually post but I read an article about a former British solider who served in Northern Ireland who supports McClean's stance. Was quite an interesting read that also explains in a little more detail why they have no reason to wear the poppy...