Both Icardi and Lukaku are goal poachers. Icardi has a better first touch while Lukaku is stronger and taller. In the past he was accused of lack of workrate but he improved in time. Neither would dribble past an entire defence so lets not expect a Ronaldo type of player here because he is not.
I can see why Ole would want him as he's very similar to he was as a player. He also scores in key games (Milan derby, Tottenham, Barcelona, Roma, Lazio etc). If it was solely about players then I wouldn't really mind. However its not really the case
You see Icardi is obsessed with Wanda Nara, an Argentinian top model. If you think that Beckham was under Victoria heels then you haven't seen Icardi with Wanda. She's got a bit of a reputation with men+ since genius here can't say no to her she also happens to be his agent as well. That lead to problems as she thought she can be a Mino Raiola when in reality she's got no idea about being an agent.
Honestly I give his chances of leaving Italy as slim. Sure there's a witch hunt going on against Wanda as she overplayed her hand with Inter. Football is still considered a male thing in Italy and having this 'model' trying to out muscle the club isn't really accepted here. Having said that, her children had settled down well in Italy, they are close to their father ( Maxi Lopez) as well, not to forget that she's also a presenter at Tika Taka, a famous football tv show in Italy.