Agreed. For the £5m difference you have someone that is likely to not only increase in value over time, which the opposite to Lennon, and also IMO he is the type of player we could really use as another direct option.
Liverpool had an incredible season the year before last (not even bothered admitting it because they ruined it themselves by flopping last year lol), by being direct and having a pacey front line mixed with a high-pressure possession style.
They flopped last season simply because the two best players who offered the direct attacking were Sturridge and Suarez were obviously out injured/ busy winning the Champions League instead.
The best way to break down 10 men behind the ball, is to keep going at them until you get one chance and score. If we had Lukaku, Mirallas, Shaqiri, Mertens, Deulofeu and Barkley as our options, we'd be one of the most dangerous teams in the league.
Without doing a Football Manager style post (which I think isn't even far off how most teams operate these days):
Sell:
Gibson
McGeady
Buy:
Shaqiri
Mertens
Van Dijk
By doing this, which should be within our means, we'd smash everyone all over the place.