Haha, yeah right, others teams had injuries you know, like Henry and van Persie missing over half the season, they had the best goals to games ratio in the league, so either one of them could have won the golden boot if they hadn't missed so much of the season, plus we had plenty of other injuries.
And it's not as though any of the top 4 will be standing still, they'll all be moving forward with signings of their own and will all want to be challenging for the title, not just scraping into the top 4! So there's no way you'll "easily" be getting into the top 4.