I have been theory crafting teams(with a bit of application) with a falcon main for about 2 years now and I believe ICs can be a fairly strong team partner if the other player knows how to play with you and you play ICs completely differently in teams. Due to nana's vulnerability in teams the ICs player is often the main focus of the opposing team, this means a defensive/stage controlling shield based game plan works well. This strategy revolves around your partner being able to move fast enough and punish the opponents when they over extend from a range where they are deceived about their safety in aggression, I believe the only characters well suited to this strategy are Falcon and Fox because of their horizontal movement speed and great edgeguards. As the ICs in this strategy you must be very cautious and patient, often holding shield more than you would in singles(if it breaks you can often hit someone with nana in the confusion of doubles) and wavedashing into quick punishing smashes when appropriate. We have found that if I use my great wavedash to grab ledge from recovering opponents and he covers high options with falcons aerials we are able to have great coverage when edgeguarding and because of that plan I rarely get hit by his aerials near the edge of the stage because I stay on the ground. We have been very successful vs fast faller teams or mixed but have experienced problems with characters like marth and puff.
