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This note is an attempt to interpret some excesses, not yet significant dueto systematics, observed by ATLAS and CMS in various analyses related to thestandard channels ttH, ttZ and ttW. It is argued, within a compositeinterpretation of top particles, that such excesses are not necessarily relatedto these channels themselves, although this is not excluded, but due to theunderlying presence of either vector-like heavy quarks tprime,bprime or tofinal states as predicted in composite theories. The outcome of this discussionis that although it will not be easy to reach an exclusive interpretation, thedata collected at 13 TeV may establish the origin of this effect as coming fromthe four top quark topology.

ttH, ttZ and ttW measurements at LHC and top quark compositeness