Not necessarily. Napoleon couldn't have outflanked the British Left at Mont St. Jean because that would have put his army between the Prussians and the British. He couldn't have outflanked the British right because the only way to do so was guarded by 17,000 prime troops at Nivelles (I believe that is the name of the crossroads). Wellington (and the whole of the British army for that matter) expected something cleverer than he got on the 18th of June.had he attempted to outflank the Allied force and push it from its position, he'd have won.
What Napoleon should have done was concentrate on beating the British army at Quatre Bras. This would have forced the British to fall back on their lines of communication to the coast. Then and only then should he have attacked the Prussians.
By attacking the Prussians first Napoleon allowed the British to fall back on their own accord, and by giving the Prussians a 12-hour head start before sending Grouchy he allowed the British and Prussians armies to meet up.
Then there is the whole farce of D'Erlon's corps during the battles of Ligny and Quatre Bras, which spent the entire day marching from Napoleon to Ney and back again without fighting in either battle.
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