I see, I see. Could you go into a bit more depth about the concentrated power?
(I understand if your are talking about the economic or military strength of nation, or how some nations excelled in some fields.)
Well, it's a matter of how the Germans worked v. their various rivals. France and the UK both had a strong naval-military tradition that viewed the world in a global sense. The French and English actually arguably fought a precursor of WWI against each other in the 18th Century and their wars were always fought on a global scale, while it's significant that all post-Napoleonic Anglo-French flashpoints were outside Europe. This meant that the French and the UK, while overall far stronger, had to dissipate their strength over a global scale and had thus relatively less room to maneuver in a short term but a nearly irresistible power in a long-term sense.
Russia, by comparison, has somewhat more comparison to Germany in that both were strong land powers without any real strategic ability to have more than a glorified coast defense force. However in contrast to Germany Russia had a huge eastern frontier in Siberia before Germany had completed its experiences with the 30 Years' War. RussGeria, however, had major problems translating the enormous overall potential it wielded into actual power for a number of reasons, some institutional, others geographically determined, others arising from a mixture of both reasons. It was, however, the first European power aside from Spain to truly qualify as Global.
In the WWI timeframe, however, Russia was in a deep crisis from its own successes in industrialization forcing it to start having to face its long-term weakness at that intermediary level between the imperial and the local, while it lost a war with Japan and never managed to fully dig out of the shock of the 1905 Revolution by the time of the outbreak of WWI. Germany exploited this and the mistake made to assume that a Russia that was badly weak at the start was always going to be thus was the truly disastrous mistake on the part of the Germans, and played a major role in what happened to them in WWII.
By comparison to these powers, Germany is weaker, but its weaker strength is geographically concentrated in Central Europe where it has the strategic position of interior lines, and due to the Prussian inheritance an army more of quantity than quality. What Germany chose to do, however, was to direct their goals by being the centerpoint of one European and one global alliance against three powers far stronger than it was in both wars. In this its power is sharply limited, but it is a very relative limit.