Bruins top 5 pick in 2010 was Torontos pick that they got for Kessel and have shipped away to Dallas because they weren't thrilled with him
The Kings had top 5 picks in 2007, 2008 and 2009. Bruins in 2006 & 2010
As for the Kings, the #4 in the 2007 Draft hasn't played in the NHL, and the #5 pick in the 2009 Draft was traded with others to Philly in the offseason before they won the Cup.
i would really say that those teams took the 'suck for years to get top 5 picks' approaches to win their cups